Question

when a brake are applied to a car,it retarded uniformly at 5m/s² and stop after 15s. find initial velocity of the car.​

Answer 1

Please find the explanation attached. Hope this helps. Thanks.

Answer 2

Answer:  

retardation = - 5 m/s²

time = 15 sec  

use kinematics formula,  

V = U + at

where V is final velocity , U is initial velocity , a is acceleration and t is time .  

here V = 0

U =?  

a = -5 m/s²  

t = 15 sec

then,

0 = U -5× 15  

U = 75 m/s²

hope it helps  

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