It is given that:
Mass of the bugghi, mb = 200 kg
Velocity of the bugghi, Vb = 10 km/h
Mass of the boy, mboy = 25 kg
Velocity of the boy, VBoy = 4 km/h
Consider the boy and the bugghi as a system.
The total momentum before the process of sitting remains same after the process of sitting.
Using the law of conservation of momentum, we can write: