For how long should a force of 100 N act on a body of 20 kg so that it acquired a velocity of 100 m/s?
Force F = m (v-u)/t ........equation 1
u is initial velocity = 0
v is final velocity = 100m/s
F = 100N
m = 20kg
Putting these values in equation 1 we can find time t
100 = 20(100-0)/t
t = 20 seconds