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## Homework Statement

Hi everyone, this is the attempted problem.

A car starts from rest and accelerates at 5m/s^2 for 15 seconds. It than decelerates at -2m/s^2 for an unknown time (say t').

Calculate how long it takes for the car to stop

## Homework Equations

I know I should be used, the constant equations of acceleration. E.g Integrate

__v = u + at__but after this I get confused

## The Attempt at a Solution

Initial velocity is 0, and velocity after 15 seconds is 75m/s.

Now after this where can I go?