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A man of mass m is standing on a station...

A man of mass m is standing on a stationary flat car of mass M. The car can move without friction along horizontal rails. The man starts walking with velocity v relative to the car. Work done by him

A

is less then `1/2mv^(2),` if he walks along the rails

B

is equal to `1/2mv^(2),` if he walks normal to the rails

C

can never be less than `1/2mv^(2),`

D

is greater then `1/2mv^(2),` if he walks aling the rails

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