Question

1. A 25 kg crate is pulled at constant speed a distance d = 5.7 m up a frictionless ramp to a height h of 2.5 m above its starting point. Calculate the:
a. force must the cable exert on the crate
b. work is done on the crate by the force in (a)
c. work is done if the crate is raise by the same height on another ramp at a different slope.

Answer 1

do part b first, makes part a trivial
b) work = m g h = 25 * 9.81 * 2.5
a) force = work/distance = part b / 5.7
c) oh come on, m g h if no friction