With a uniform movement of a load weighing 11 kg along an inclined plane, the dynamometer attached to the load showed

With a uniform movement of a load weighing 11 kg along an inclined plane, the dynamometer attached to the load showed a force equal to 35 N. Calculate the efficiency of the inclined plane if its length is 1.8 m and its height is 30 cm.

Given:
m = 11 kg
F = 35 n
l = 1.8 m
h = 30 cm = 0.3 m
To find:
Efficiency =?
Decision:
Work on moving the load A = F * l = 35 * 1.8 = 63 J
Useful work E = m * g * h = 11 * 10 * 0.3 = 33J (g = 10 m / s ^ 2)
K = (E / A) * 100% = (33/63) * 100 = 52%