The mass m is placed on a body of mass M...

The mass m is placed on a body of mass M. There is no friction. The force F is applied on M on it moves with acceleration a. Then, the force on the top body is

F - ma

None of these

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The correct Answer is:

Since, no force of friction is present. So, no horizontal force is present on body of mass m. In vertical direction normal force balances weight of the body. Hence, net force of top body must be zero. Lesser contact force corresponds more comfortableness.

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