Choose the correct alternative: Work done by a body against friction always results in a loss of its kinetic/potential energy.

Work done by a body against friction always result in a loss of its

Choose the correct alternative: When a conservative force does positive work on a body, the potential energy of the body increases/decreases/remains inaltered.

Choose the correct alternative: i)Acceleration due to gravity increases/decreases with increasing altitude. ii)Acceleration due to gravity increases/decreases with increasing depth. iii)The total energy of an orbiting satellite is negative of its kinetic/potential energy. iv)The polar satellite go around the earth in a north-south direction/east-west direction.

choose the correct alternative: escape velocity is independent of the mass of the earth/ the mass of the body.

A body is rolling on a horizontal surface. Derive an equation for its kinetic energy.

Choose the correct alternative from the bracket. Power of a lens Is the reciprocal of its focal length expressed in______ (Dioptre// metres)

According to the work- energy theorem, work done by a force on a body is equal to change in its kinetic energy. Prove the theorem.