Work Energy And Power

A particle of mass is thrown vertically upwards with a speed of . the work done by the force of gravity during the time the particle goes up is

A mass of and a mass of have same , then the ratio of their momentums will be

A small bead of mass slides on a smooth wire that is bent in a circle of radius . It is released at the top of the circular part of the wire (point A in the figure) with a negligibly small velocity. Find the height H where the bead will reverse direction.

A particle is moving in translatory motion. If momentum of the particle decreases by , kinetic energy will decrease by