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

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

The average velocity in the first three minutes is 180m / min, and that in the last four minutes is 90m / min. because the average velocity is the velocity in the middle of the time period, the interval between the two average velocities is 3.5min. From at = v0-v1, a = 180 / 7 m / min & # 178 is obtained;