# Engineering Physics

A car and a train move together along straight, parallel paths with the same constant cruising speed v(initial). At t=0 the car driver notices a red light ahead and slows down with constant acceleration -a(initial). Just as the car comes to a full stop, the light immediately turns green, and the car then accelerates back to its original speed v(initial) with constant acceleration a(initial). During the same time interval, the train continues to travel at the constant speed v(initial).

How much time does it take for the car to come to a full stop? t1 = ?
How much time does it take for the car to accelerate from the full stop to its original speed? t2 = ?
The train does not stop at the stoplight. How far behind the train is the car when the car reaches its original speed v(initial) again?
delta d = ?

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1. Engineering Physics? I will be happy to critique your thinking or work.

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2. A car and a train move together along straight, parallel paths with the same constant cruising speed v0. At t=0 the car driver notices a red light ahead and slows down with constant acceleration −a0. Just as the car comes to a full stop, the light immediately turns green, and the car then accelerates back to its original speed v0 with constant acceleration a0. During the same time interval, the train continues to travel at the constant speed v0.

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3. Personally I think this question is and you shouldn't worry about it :)

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