Q6.19Multiple correct
A man, of mass m, standing at the bottom of the staircase, of height L climbs it and stands at its top.
- (a)Work done by all forces on man is equal to the rise in potential energy mgL.
- (b)Work done by all forces on man is zero.
- (c)Work done by the gravitational force on man is mgL.
- (d)The reaction force from a step does not do work because the point of application of the force does not move while the force exists.