Question

1. The momentum of a garbage truck that is 1.20 × 10⁴ kg and is moving at 10.0 m/s is
2. At what speed would an 8.00-kg trashcan have the same momentum as the truck?

Answer 1

1)

$$p=mv=1.2\cdot10^4\ kg\cdot10\ \dfrac{m}{s}=1.2\cdot10^5\ \dfrac{kgm}{s}.$$

2)

$$v=\dfrac{p}{m}=\dfrac{1.2\cdot10^5\ \dfrac{kgm}{s}}{8\ kg}=1.5\cdot10^4\ \dfrac{m}{s}.$$