Question

A 50kg man is standing at one end of a 25 m long boat. He starts running towards the
other end. On reaching the other end his velocity is 2 ms. If the mass of the boat is
200 kg final velocity of the boat is (in ms)
(​

Answer 1

Answer:

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=−

5

2

m/s

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