Question

A force of 35 N is needed to keep a 5.0 kg body moving at a constant speed of 7.5 m/s. What power is needed to sustain the motion of the mass?

Answer 1

By the definition of the power, we have:

$$P=Fv=35\ N\cdot 7.5\ \dfrac{m}{s}=262.5\ W.$$

Answer:

$P=262.5\ W.$