1.

A block of mass m is placed gently onto a long plank of mass M moving with a velocity `v_(0)` on a smooth horizontal floor. If friction is present between M and m : A. `v_("centre of mass") =(Mv_(0))/(M+m)`B. `W_("friction")` on m is positiveC. `W_("Friction")` on M is negativeD. final velocity of both `= (mv_(0))/(m+M)`

Answer» Correct Answer - ABC
`v_(C)=(Mv_(0))/(M+m)`
`v_(5)=(Mv_(0))/(m+M)`


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