Question

What velocity must a 15kg object be moving at in order for it to have a momentum of 54kgm/s?

Answer 1

By the definition of the momentum, we have:

$$p=mv,$$ $$v=\dfrac{p}{m}=\dfrac{54\ \dfrac{kgm}{s}}{15\ kg}=3.6\ \dfrac{m}{s}.$$

Answer:

$v=3.6\ \dfrac{m}{s}.$