Question

1500-kg car and a 5000-kg bus are both moving at a speed of 75 km/hr on a southward highway.
Calculate the momentum of each vehicles.

Answer 1

Convert 75 km/h to m/s:

$$v=75·1000/2500=20.83\text{ m/s}.$$

Momentum of the car:

$$p_c=m_cv=31250\text{ kg m/s},$$

momentum of the bus:

$$p_b=m_bv=104150\text{ kg m/s}.$$