1.

A ball of mass m falls vertically to the ground from a height h1 and rebound to a height \[{{h}_{2}}\]. The change in momentum of the ball on striking the ground is [AMU (Engg.) 1999]

A.          \[mg({{h}_{1}}-{{h}_{2}})\]
B.                       \[m(\sqrt{2g{{h}_{1}}}+\sqrt{2g{{h}_{2}}})\]
C.          \[m\sqrt{2g({{h}_{1}}+{{h}_{2}})}\]
D.                       \[m\sqrt{2g}({{h}_{1}}+{{h}_{2}})\]
Answer» C.          \[m\sqrt{2g({{h}_{1}}+{{h}_{2}})}\]


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