There is an elevator, the acceleration is 2m / S2 when starting, the acceleration is - 1m / S2 when braking, the building height is 52m? (2) If the elevator accelerates first, then rises at a constant speed, and finally decelerates for 16 seconds, what is the maximum speed?

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• 1. A train moves uniformly in a straight line with an initial speed of 2m / s and an acceleration of 0.5m/s2. The speed of the train at the end of the third second is______ M / s, the average velocity in the first four seconds is______ M / s, the displacement in the fifth second is______ m．
• 2. A train moves uniformly in a straight line with an initial speed of 2 m / s and an acceleration of 0.5 m / S2? (2) What is the average speed in the first four seconds? (3) What is the displacement in 5S?
• 3. For two objects moving in a straight line, the acceleration of a is 1m / S2, and the acceleration of B is - 2m / S2 For two objects moving in a straight line, the acceleration of a is 1m / S2, and the acceleration of B is - 2m / S2 A is to accelerate and B is to decelerate B is in the opposite direction of acceleration
• 4. For two objects moving in a straight line, the acceleration of a is 1m / S2, and the acceleration of B is - 4m / S2 A. The acceleration of a is greater than that of B. A accelerates and B decelerates. C. the acceleration of B is greater than that of A. D. the direction of acceleration of a and B is opposite
• 5. The acceleration of a is 1m / S2, and the acceleration of B is - 2 / / S2. Judge whether this option is correct? (see below) The acceleration of B is larger than that of a, but the acceleration direction of a and B may be the same or different. I have read the complete question on Baidu, but there are different opinions about this option. I want to hear the positive solution! And I, can you talk about the relationship between acceleration direction and velocity direction in detail? Is the former bound by the latter?
• 6. The object moves in a straight line with uniform acceleration at an initial velocity of 2m / s, and the acceleration is 1m / s. calculate the average velocity within the first 6S and the first 8s of the velocity at the end of the third second
• 7. Find out the whole process -- the object makes uniform acceleration linear motion, = 2m / s, acceleration a = 0.1m/s2, find out the velocity VT at the end of the fourth
• 8. For an object moving in a straight line with uniform acceleration, the initial velocity VO = 2.0 M / s, and the displacement passing through in the third second is 4.5 m, what is its acceleration? Physics in senior one
• 9. The object starts to move in a straight line with uniform acceleration from a static state, and the acceleration is 2m / s. The distance it passes in a certain 1s is 15m. Find (1) what is the velocity of the object at the beginning of 1s? (2) how long has the object moved before 1s? (3) how many distances has the object passed before 1s
• 10. It must be adopted in a short time, thank you) an object moves in a straight line with uniform acceleration, the initial velocity is 10m / s, and the acceleration is 2m / s When an object moves in a straight line with uniform acceleration, the initial velocity is 10m / s, and the acceleration is 2m / S ^ 2. What is the average velocity of the object in the second second second
• 11. When an elevator starts, the acceleration is 2 m / S2, when braking, the acceleration is 1 m / S2, and the building height is 64 M (1) If the maximum speed is 6 m / s, what is the shortest time for the elevator to reach the top of the building? (2) If the elevator first accelerates, then rises at a constant speed, and finally decelerates, the total time is 16 seconds?
• 12. A train set out from the station to do uniform acceleration linear motion, 0.5m/s, at this time there is just a A train starts from the station and makes a uniform acceleration linear motion, 0.5m/s. At this time, a bicycle (which can be regarded as a particle) passes by the locomotive, V0 = 8m / s, and the length of the train is L = 336m?
• 13. Someone estimates the acceleration of the train with a watch. First, he observes for 3 minutes and finds that the train is moving 540 meters. Then he observes for 1 minute after 3 minutes and the train is moving 360 meters Its analytical formula is a = (360-180) / (6.5-1.5) = 36 m / min * min = 0.6, where 6.5 and 1.5 come from Someone uses a watch to estimate the acceleration of a train. He first observes for 3 minutes and finds that the train is moving 540 meters. After 3 minutes, he observes for 1 minute and the train is moving 360 meters. If the train moves in a straight line with uniform acceleration within 7 minutes, what is the acceleration of the train? A = (360-180) / (6.5-1.5) = 36 m / min * min = 0.6. I just want to know how to calculate 6.5 and 1.5 in this formula. Please answer.
• 14. Someone estimates the acceleration of the train with a watch. He observes it for 3 minutes and finds that the train is 540 meters ahead. After 3 minutes, he observes it for 1 minute and finds that the train is 360 meters ahead. If the train is moving in a straight line with uniform acceleration within 7 minutes, the acceleration of the train is () A. 0.03m/s2B. 0.01m/s2C. 0.5m/s2D. 0.6m/s2
• 15. Someone estimates the acceleration of the train with a watch. He observes it for 3 minutes and finds that the train is 540 meters ahead. After 3 minutes, he observes it for 1 minute and finds that the train is 360 meters ahead. If the train is moving in a straight line with uniform acceleration within 7 minutes, the acceleration of the train is () A. 0.03m/s2B. 0.01m/s2C. 0.5m/s2D. 0.6m/s2
• 16. Someone used a watch to estimate the acceleration of the train, first observed for 3 minutes, and found that the train was moving 540 meters; then observed for 1 minute after 3 minutes, and found that the train was moving 360 meters Suppose the train moves in a straight line with uniform acceleration, what is the acceleration of the train estimated by the person
• 17. Someone uses a watch to measure the acceleration of a train. First, measure it for three minutes. The train runs 540 meters. After three minutes, measure it for another minute. The train runs 360 meters. If the train is seven minutes Someone uses a watch to measure the acceleration of a train. First, he measures it for three minutes. The train runs 540 meters. Then, he measures it for another minute after three minutes. The train runs 360 meters. If the train accelerates in a straight line within seven minutes, can he calculate the acceleration of the train?
• 18. Someone estimates the acceleration of the train with a watch. He observes it for 3 minutes and finds that the train is 540 meters ahead. After 3 minutes, he observes it for 1 minute and finds that the train is 360 meters ahead. If the train is moving in a straight line with uniform acceleration within 7 minutes, the acceleration of the train is () A. 0.03m/s2B. 0.01m/s2C. 0.5m/s2D. 0.6m/s2
• 19. Some students took the power train to travel. When the train was speeding up on a straight track, one student suggested: "can we use the equipment around us to measure the acceleration of the train?" Many students participated in the measurement work. The measurement process was as follows: they looked out of the window every 100m; They observed that the time interval from the first signpost to the second signpost was 5S, and the time interval from the first signpost to the third signpost was 9s. Please calculate: (1) the speed of the train; (2) the speed when they reached the third signpost according to their measurement
• 20. A train starts to move in a straight line with uniform acceleration at an acceleration of 0.5m/s from standstill (1) What's the speed of the train at the end of the fourth second? (2) What is the average speed in the first three seconds? (3) What is the displacement at 5S? (4) What is the displacement in the second 5S?