TOPIC: Impulse and Momentum

1. A football player runs at 8 m/s and plows into an 80 kg referee standing on the field causing the referee to fly forward at 5.0 m/s. If this were a perfectly elastic collision, what would the mass of a football player be?

2. A tow-truck applies a force of 2,000 N on a 2,000 kg car for a period of 3 seconds. What is the magnitude of the change in the car's momentum? If the car starts at rest, what will be its speed after 3s?