The train goes from ground a to ground B with constant acceleration a, and then decelerates to ground C with constant acceleration a / 3 in the original direction. The distance between ground a and ground C is 18km, and the train runs for 20min. The distance between ground a and ground B and the acceleration a are calculated

The answer is: the distance between a and B is 450m; the acceleration a is 0.1m/s2

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1. The train starts from station a and makes a uniform acceleration with acceleration of A. after passing station B, it changes to drive along the original direction and decelerates with acceleration of a, and stops at station C. It is known that the distance between station a and station C is 24km, and the train has been running for 24min, then the distance between station a and station B is 24km____ Km, the speed of the train passing station B is____ km / min . The answer is 6 and 2 Sorry, the second a should be changed to a / 3, I didn't notice when I was fighting
2. 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?
3. 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?
4. 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?
5. 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
6. 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
7. 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?
8. 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
9. 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
10. 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
11. The train starts from ground a at rest and accelerates to ground B at a constant acceleration of a, then decelerates to ground C at a constant acceleration of a / 3 in the original direction and stops If the distance between a and C is 28.8km, the vehicle has been running for 24min
12. From the station there is a static train out of the uniform acceleration movement, the first 1 min running 540 m to calculate acceleration~
13. A subway train starts from a station at rest and moves along a straight line. First, it accelerates uniformly with the acceleration A1, then decelerates uniformly with the acceleration A2. When it arrives at station B, it just stops. If the distance between the two stations is x, find the time t
14. A subway train starts from a static station and moves along a straight line. It first accelerates uniformly with the acceleration A1, and then decelerates uniformly with the acceleration A2 A subway train starts from a static station and moves along a straight line. First, it accelerates uniformly with the acceleration A1, and then decelerates uniformly with the acceleration A2. When it arrives at the station B, it just stops. If the distance between the two stations is x, what is the maximum speed of the train in operation?
15. It takes 3.5 seconds for a train to pass a road sign and 20 seconds to pass a 300 meter long bridge. It takes a long time for a train to cross an 800 meter long cave______ Seconds
16. It takes 5 seconds for a train to pass a road sign, 20 seconds to pass a 300 meter long bridge, and how many seconds to cross an 800 meter long cave Write the analysis, too
17. It takes 5 seconds for a train to pass a road sign, 20 seconds to pass a 300 meter cave, and how many seconds to pass an 800 meter bridge? Using equation
18. It takes 6.5 seconds for a train to pass a sign, 23 seconds to pass a 300 meter long bridge, and a few seconds to cross an 800 meter long cave
19. It takes 3.5 seconds for a train to pass a road sign and 20 seconds to pass a 300 meter long bridge. It takes a long time for a train to cross an 800 meter long cave______ Seconds
20. The temperature of the track rises when the train is running on it The teacher said that this is the same as the friction between hands, overcoming the friction to do work I mainly want to understand why the temperature of the rail rises because of work Can it be understood as follows: When the train is running, it overcomes the friction to do work, and the internal energy increases and the temperature rises; Because the friction is mutual, the rail is also subject to friction. If the train is taken as a reference, the rail is moving and works against the friction Is that right?