Q-if 'm' is the mass of a body, projected with velocity 'u' making an angle'x' with the horizontal, the change in velocity between the point of projection and impact will be?
Q-a solid sphere and solid cylinder having the same mass and radius roll down the same inclined plane . The ratio of their accelerations will be?

1. If you mean that the body travels from ground level to a certain distance at ground level... What do you think is the answer? There are only three possibilities for the magnitude of the moving body; the speed is less, the same as at the projection, or the spped is greater. The law of conservation of momentum should help you.

Have you tried having a sketch to help you? A sketch usually comes in very handy.

2. Make use of your F=ma formula. That'll hint you to the answer.