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A man of mass m moves on a plank of mas...

A man of mass `m` moves on a plank of mass `M` with a constant velocity `u` with respect to the plank, as shown in figure.
a.If the plank rests on smooth horizontal surface, determine the velocity of the plank.
b If the man travels a distance `L` with respect to the plank, find the distance travelled by the plank with respect to the ground.

A

`(Mv)/(m+M)`

B

`(mv)/(M)`

C

`(Mv)/(m)`

D

`(mv)/(m+M)`

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