A man is slipping on a frictionless inclined plane and a bag falls down from the same height. Then the velocity of both is related as

Two masses as shown in the figure are suspended from a massless pulley. The acceleration of the system when masses are left free is

A body of mass 3 kg hits a wall at an angle of 60^o and returns at the same angle. The impact time was 0.2 sec. The force exerted on the wall

If $$\overrightarrow F = \left( {60\widehat i + 15\widehat j - 3\widehat k} \right)$$ N and $$\overrightarrow v = \left( {2\widehat i - 4\widehat j + 5\widehat k} \right)$$ m/s, then instantaneous power is