Aperson driving a car suddenly applies the brakes. the car takes 4 s to come to rest while traveling 20 m at constant acceleration. can the speed of the car immediately before the brakes were applied be determined without first determining the car’s acceleration?

Yes we can find the initial velocity of car without finding acceleration.

u = 10 m/s.

Explanation:

Given that

s=20 m

Car takes 4 s to come in rest.

We know that when acceleration is constant then we can apply motion equation

       ----------1

      ------2

From equation 1 and 2

So we can say that

Given that the velocity of car at final condition will be zero (v=0)

From the above equation we can find the initial velocity of car without finding the acceleration

u = 10 m/s

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