Question

A bus starts from rest and attains a velocity of 54kmh^1 in 20s . Find the acceleration of the bus

Answer 1

Answer:

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Answer 2

Answer:

First calculate the acceleration of the bus.

a = (v - u)/t; where a = acceleration, v = final velocity, u = initial velocity, and t ,= time interval

List the knowns and unknown.

a = ? m/s²

u = 0 m/s

v = 54 km/h × 1000 m/1 km × 1 h/3600 s = 15 m/s

t = 20 s

Calculate the acceleration.

a = (15 m/s - 0 m/s)/(20 s) = 0.75 m/s²

Use the following kinematic equation to calculate the displacement of the bus.

d = (u + v)/2 × t

d = (0 m/s + 15 m/s)/2 × 20 s

d = 15 m/s/2 × 20 s = 7.5 m/s × 20 s = 150 m