You are at a train station, standing next to the train at the front of the first car. The train starts moving with constant acceleration, and 7.0 s later the back of the first car passes you. Part A How long does it take after the train starts moving until the back of the seventh car passes you

18.5 s

Explanation:

We are given that

Time,t=7 s

Number of  cars=7

Initial velocity =u=0

Length of  a car=L

Using the formula

Length of seven cars=7L

Hence,it takes 18.5 s after the train starts moving until the back of the seventh car passes you

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higher potential

explanation:

because it is in a high speed so it must move into a of high potential