Along an inclined plane 5 m long and 1.5 m high, a load was evenly lifted, the gravity of which was 1800N, the force moving the

Along an inclined plane 5 m long and 1.5 m high, a load was evenly lifted, the gravity of which was 1800N, the force moving the load to the top along the inclined plane was 1080N. Find the efficiency of an inclined plane?

Given:
l = 5 m
h = 1.5 m
Ft = 1800 N
F = 1080 N
nu =?
Decision:
nu = Ap / Az // efficiency
Ap = Ft * h = 1800 * 1.5 = 2700 J // work of gravity
Az = 1080 * 5 = 5400 J // work expended when lifting the load
nu = 2700/5400 = 0.5 = 50%
Answer: 50%