A ball of mass m falls vertically to the...

A ball of mass `m` falls vertically to the ground from a height `h_1` and rebound to a height `h_2`. The change in momentum of the ball on striking the ground is.

`mg(h_(1)-h_(2))`

`m(sqrt(2gh_(1))+sqrt(2gh_(2)))`

`msqrt(2g(h_(1)+h_(2)))`

`msqrt(2)(h_(1)+h_(2))`

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