A man of mass m moves with a constant sp...

A man of mass m moves with a constant speed on a plank of mass 'M' and length 'L' kept initially at rest on a frictionless horizontal surface, from one end to the other in time 't'. The speed of the plank relative to ground while man is moving, is -

`L/t(M/m)`

`L/t(m/(M+m))`

`L/t(m/(M-m))`

None of these

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