Question

a bus was moving with a speed of 54 km per hour on applying brakes it stopped in 8 seconds calculate the acceleration

Answer 1

Answer:

Decleration = 27/ 8 or accleration = -27/8

Explanation:

Deceleration is negative acceleration

This happens when the initial velocity is greater than the final velocity

Given ,

u = 54 m/ s

v = 0 m/ s ( because the bus is at rest now )

t= 8s

As we know

a = v - u / t and deceleration = u- v / t

deceleration = 54 - 0 / 8

=>de = 54/ 8 = 27/4

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