In gravity-free space, a man of mass M standing at a height h above the floor throws a ball of mass m straight down with a speed u. When the ball reaches the floor, the distance of the man above the floor will be -
A
h 
B
h 
C
2h
D
A function of m, M, h and u
Text Solution
Verified by ExpertsThe correct answer is:
A
Due to conservation of momentum in the vertical direction, the man will begin to move up with speed 
. The ball will reach the floor in time 
. In this time the man will move up by 
. Total distance of man from floor = h + 
.
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