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

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

Two projectiles of same mass and with same velocity are thrown at an angle 60^o and 30^o with the horizontal, then which will remain same

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