A man throws a ball of mass ra from a moving plank
A
. The ball has a horizontal component of velocity 
with respect to ground towards another man standing on stationary plank
with respect to ground towards another man standing on stationary plank
B
, as shown in the figure. The combined mass of plank A with man as well as that of plank B with the other man is 2m each, the x-y plane represents the horizontal plane which is frictionless. If initially, plank A was moving with speed 
with respect to ground, then the relative velocity of plank B (in m s -1 ) with respect to plank A (after the man on plank B catches the ball) minus 10 m s -1 is 
with respect to ground, then the relative velocity of plank B (in m s -1 ) with respect to plank A (after the man on plank B catches the ball) minus 10 m s -1 is
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(7)
By conservation of momentum,
Similarly 
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