Question

For how long shpuld a force of 100n act on a body of mass 20kg at rest so that it acquires a velocity of 100 m per second

Answer 1

Force = mass × Acceleration

Acceleration = Force / mass

= 100 / 20 = 5 m/s²

Acceleration = change in velocity / time

Change in velocity = Final velocity - initial velocity

final velocity = 100m/s

Initial velocity = 0

Change in velocity = 100 - 0 = 100 m/s

5 = 100 / t

5t = 100

t = 100/5 = 20

20 seconds