Question

Find the initial velocity of a car that is stopped in 10 seconds by applying brakes the retardation due to the brakes is 2.5 M per second square

Answer 1

Heya user !!!

Here's the answer you are looking for

Let the initial velocity be u

We know final velocity (v) = 0 as it comes to rest

Time taken (t) = 10sec

Acceleration (a) = -2.5m/s² ( as it is retardation)

Using the 1st equation of motion, that is

v = u + at

0 = u + (-2.5)(10)

u = (2.5)(10) = 25m/s

Therefore, the initial velocity is 25m/s


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Answer 2

v = u + at
0 = u + (-2.5 m/s² × 10 s)
u = 25 m/s

Initial velocity of car was 25 m/s