Question

a man of mass 50 kg jumps out of a body of mass 100 kg with a velocity of 5 metre per second what is the magnitude of velocity with which the boat moves if no external force is acting on man and boat system.

Answer 1

Explanation:

Let final velocity of boat be v.

So velocity of man with respect to ground is 2+v

As Center-of-mass of system should remain at rest, in absence of external force,

50(2+v)+200v=0⟹v=−2/5m/s

negative sign idicates that the velocity of boat is in opposite direction to that of the man.