Respuesta :

We have:

W = weight = 1500 N

D = distance = 5 m

Energy input = 15000 J

Apply:

Efficiency= useful output energy / input energy

Work = weight x distance = 1500 N x 5 m = 7500 J (useful output energy )

Efficiency = 7500 J / 15000 J = 0.5 or 50%