Question

In a gravity free space, a man of mass M standing at a height h above the ground throws a ball of mass m straight down with speed u. When the ball reaches the ground the distance of the man from above the ground is?​

Answer 1

Answer:

the centre of mass of the system doesn't change

i.e...,

change in COM=0

consider the man M moves a distance of X in the opposite direction (gravity free space)

therefore,

M(X) + m (-h) = 0