(c) Zero
Reason — When a body revolves in a circular path under the influence of a force, on completing one round the displacement becomes zero, so the work done by the force is W = 0 because work done is a product of force and displacement.
(c) Zero
Reason — When a body revolves in a circular path under the influence of a force, on completing one round the displacement becomes zero, so the work done by the force is W = 0 because work done is a product of force and displacement.
(a) Calculate the change in the gravitational potential energy of the skier between A and B. (b) If 75% of the energy in part (a) becomes the kinetic energy at B, calculate the speed at which the skier arrives at B.(Take g = 10 ms-2).