Question

A car is retarted by applying brakes at the
rate of 2 ms^-2. It is finally stopped in
10 sec. Find its initial velocity.​

Answer 1

Acceleration = a= -2 m/s²

Time = t= 10 secs

Initial velocity = u

Final velocity = v = 0

equation of motion :-

v = u+at

So,

0 = u+(-2 x 10)

u = 2 x 10

= 20 m/s

Initial velocity = 20 m/s

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Answer 2

USING

V = U + AT

O = U + (_2)(10)

U = 20 M/ S

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