Please, do not forget to SHOW ALL YOUR WORK and Calculations and Also explain your answers.

Total: 6 questions.

Questions:

1. How much impulse is needed to stop a 20 Kg cannon ball rolling at 5 m/s?

2. A car with a mass of 1500 kg is driving at 20 m/s along a straight line higway. How much friction (newtons) is needed to stop the car in 12 seconds?

3. A car carrying a 80 kg test dummy crashes into a wall at 20 m/s and is brought to rest in 0.2 seconds. What is the average force exerted by the seat belt on the dummy?

4. Arleen (mass 50 Kg), standing on slippery ice, catches her leaping dog (mass 10 Kg) moving horizontally at at 4 m/s. What is the speed of Arleen and her dog after the catch?

5. A railroad diesel engine weighs 5 times as much as a freight car. If the diesel engine coasts at 10 km/h into a freight car that is initially at rest, what will be the speed of the coupled cars after the collision?

6. A 60 kg astronaut is on a spacewalk when the tether line to the shuttle breaks. The astronaut is able to throw a spare 15 kg oxygen tank in a direction away from the shuttle with a speed of 10 m/s, propelling the astronaut back to the shuttle. Assuming that the astronaut starts from rest with respect to the shuttle, find the astronaut's final speed with respect to the shuttle after the tank is thrown.