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

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

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: In an inelastic collision of two bodies, the quantities which do not change after the collision are the total kinetic energy/total linear momentum of the system of two bodies.

When a magnetic needle is placed in a non-uniform magnetic field it experiences. State whether the potential energy of the magnet increases or decreases after rotation. Justify your answer.