Question

A 30kg girl is riding a 20kg bike with a velocity of 10/m/s due east. What is the total momentum of a girl and a bike together?

Answer 1

By the definition of the momentum we have:

$$p_{tot} = (m_{girl} + m_{bike})v = (30 kg + 20 kg) \cdot 10 \dfrac{m}{s} = 500 kg \cdot \dfrac{m}{s}.$$

Answer:

$p_{tot} = 500 kg \cdot \dfrac{m}{s}.$