Why will a sheet of paper fall slower than one that is crumpled into a ball?

An object of mass, m is moving with a constant velocity, v. How much work should be done on the object in order to bring the object to rest?

Illustrate the law of conservation of energy by discussing the energy changes
which occur when we draw a pendulum bob to one side and allow it to oscillate. Why
does the bob eventually come to rest? What happens to its energy eventually? Is it a
violation of the law of conservation of energy?

The volume of a 500 g sealed packet is 350 cm³ . Will the packet float or sink in water if the density of water is 1 g cm^-3 ? What will be the mass of the water displaced by this packet?

The volume of 50 g of a substance is 20 cm³ . If the density of water is 1 g cm^-3 , will the substance float or sink?

Why a block of plastic does released under water come up to the surface of water?