Explanation
Work done and power developed is zero in uniform circular motion only.
From, definition, work done in moving a body against a conservative force is independent of the path followed.
When we supply current through the cell, chemical reactions takes place, so chemical energy of cell is converted into electrical energy.
When two bodies of same mass undergo an elastic collision, their velocities get interchanged after collision. Water and heavy water are hydrogenic materials containing protons having approximately the same mass as that of a neutron. When fast moving neutrons collide with protons, the neutrons come to rest and protons move with the velocity of that of neutrons.
Friction is a non-conservative external force to the system, it decreases momentum and kinetic energy both.
When m1 > m2 and m2 at rest, after collision the ball of mass m2 moves with double the velocity of u1. So, option (b) is incorrect.
When collision is oblique and m2 at rest with m1 = m2, after collision the ball moves in perpendicular direction. So, option (d) is also incorrect.
Momentum and kinetic energy is conserved only in this case.
Friction is a non-conservative force. Work done by a non-conservative force over a closed path is not zero. Hence, option (c) is a false statement.
Velocity of fall is independent of the mass of the falling body.
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