Question

Find the acceleration of a body whose velocity change from 40km/s to 55km/s in 15 second

Answer 1

acceleration = 1 km/s²

Explanation:

Given

initial velocity v1 =  40 km/s

final velocity v2 = 55 km/s

time t = 15 s

acceleration a = ??

Solution

as we know that

a = Δv / t

Δv = v2 - v1

Δv = 15 km/s ⇒ 15000 m/s

a = 15000/15

a = 1000 m/s²

a = 1 km/s²

Answer 2

Answer: 1km/s^2

Explanation:

a = v-u/t

Where v =55km/s , u =40 km/s

t= 15s

.•. a = 55-40/15= 15/15 = 1 km/s^2