Efficency = 28%
Explanation:
We have the load has a weight of:
Work in physics is defined as the product of force (weight) by distance.
where:
W = work [J]
w = weight = 117.72[N]
d = distance = 5 [m]
Now power is defined as the relationship of work at a certain time.
where:
P = power [W]
W = work = 588.6[J]
t = time = 30[s]
Now the efficiency of a machine is defined as the power output over the power input to the machine. The power input should always be greater than the power output.