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A car weights 1.30 X 10^4 N is initially moving at a speed of 40km/h when the brakes are applied and the car is brought to a stop in 15m. Assuming that the force that srops the car is constant. find a)magnitude of the force b)time required for the change in speed.

If the inital speed is doubled and the car experiances the same force during the braking by what factors are c) the stopping distance and d) the stopping time multiplied?

I have a test with this kind of problem on it soon and I still don't understand it. Please help me.

Use the impulse equation:

Force*time= mass*changeinvelocity

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    ggty

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