. A man of mass m is standing over a plank of mass M. The plank is resting on a frictionless surface as shown in figure


If the man starts moving with a velocity   with respect to plank towards right. Find the velocity with which plank will starts moving.

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Best Answer

Answer: If the man starts moving with a velocity   with respect to plank towards right. Find the velocity with which plank will starts moving.   

If plank starts moving with velocity V towards left, then the velocity of man will be (v-V)with respect to surface towards right.

Initial linear momentum of system= 0 

Final linear momentum of system = m(v-V)-MV

From conservation of momentum for the system,

m(v-V)-MV=0

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