Question

A bus was moving with a speed of 54km on appling brakes it us stooped in 5 sec calculate the retardation​

Answer 1

Explanation:

54×5/18 =15m/s

v =u+at

As the bus stops v=0

0=15 +a×5

-15/5=a

a = -3m/s^2

retardation =3m/s^2

Retardation is always positive

Answer 2

Answer

speed of bus = 54 km = 15m/s { initial velocity}

final velocity = 0

time = 5 sec

acceleration = v-u/t

        = 0 X 15 / 5

        = -3m/s

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