A man throws a ball of mass m from a moving plank (A). The ball has a horizontal component of velocity u=3sqrt(34)ms^(-1)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 is 2m each. The x-y plane represents the horizontal plane which is frictionless. If initially, plank A was moving with speed uhati 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 10ms^(-1) is

A man throws a ball of mass m from a moving plank (A). The ball has a

1.	A man throws a ball of mass m from a moving plank (A). The ball has a horizontal component of velocity u=3sqrt(34)ms^(-1)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 is 2m each. The x-y plane represents the horizontal plane which is frictionless. If initially, plank A was moving with speed uhati 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 10ms^(-1) is
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