Question

A puck with a mass of 0.170 kg has a velocity of + 90.0 km/h. The momentum of the puck is

Answer 1

Convert km/h to m/s:

$$v=90\frac{1000}{3600}=25\text{ m/s}.$$

The momentum:

$$p=mv=0.17·25=4.25\text{ Ns}.$$