Question

Once the box is at the forklift it needs to be lifted to a height of 20m. The forklift uses 4300J of energy to lift the 30kg mass. What is the efficiency of the forklift?

Answer 1

$\eta=\frac{E}{E+A},$

$E=mgh,$

$\eta=\frac{mgh}{mgh+A}=0.58=58\%.$