A ball of mass m falls vertically from a...

A ball of mass m falls vertically from a height h and collides with a block of equal mass m moving horizontally with a velecity `upsilon` on a surface. The coefficient of kinetic friction between the block and the surface is 0.2, while the coefficient of restitution e between the ball and the block is 0.5. There is no friction acting between the ball and the block. The velocity of the blockdecreases by :

`0.1sqrt(2gh)`

`0.3 sqrt(2gh)`

can't be said

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