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

(1) Study the process of the train from the first landmark to the second landmark, displacement X1 = 100m, time T1 = 5S, then the speed in the middle time is: V1 = x1t1. Similarly, study the process of the train from the second landmark to the third landmark, displacement x2 = 100m, time T2 = 4S, then the speed in the middle time is

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1. 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
2. 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?
3. 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
4. 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
5. 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
6. 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.
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12. A train starts at a standstill and moves in a straight line with a constant acceleration of a = 0.5 m / S2. We can find: (1) what is the speed of the train at the end of the third second? (2) What is the average speed in the first four seconds? (3) What is the displacement in the second 4S?
13. First, do the uniform acceleration motion with the acceleration of A1, and then do the uniform deceleration motion with the acceleration of A2 According to the meaning of this sentence, A1 × t = A2 × t ', instead of adding a negative sign before A2, right?
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