Two persons manage to push a motor car of mass 1,200 kg at uniform velocity on the road. The same motor can be pushed by three persons to produce an acceleration of `0.2 ms^(-2)`. With what force does each person push the motor car ?( Assume that all persons push motor car with same muscular effort.)

Explanation

Case I
Mass, m = 1200 kg
Velocity = v (uniform velocity)
`therefore` Acceleration , `a = 0 ms^(-2)`
Force `= m xx a`
`= 1200 kg xx 0 ms^(-2) = 0N`
Case II
Mass, m = 1200 kg
Acceleration , `a = 0.2 ms^(-2)`
Force `= m xx a`
`F = 1200 kg xx 0.2 ms^(-2)`
F = 240 N
Force applied by each person = 240 N