Acar initially going 61 ft/sec brakes at a constant rate (constant negative acceleration), coming to a stop in 7 seconds.
a) graph the velocity from t = 0 to t = 7.
(b) how far does the car travel?
(c) how far does the car travel if its initial velocity is doubled, but it brakes at the same constant rate?

See the attachment below for the graphics in part (a)

The initial velocity for this time interval is u = 61ft/sec and the final velocity is 0m/s because the car comes to a stop.

This a constant acceleration motion considering the given time interview over which the brakes are applied. So the equals for constant acceleration motion apply here.

Explanation:

The full solution can be found in the attachment below.

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the answer should be in the picture.