1. The roller coaster starts from rest at point A. Rank these quantities from greatest to least at each point: (a) speed, (b) kinetic energy, (c) potential energy. 2. A car with a mass of 1000 kg...

1. The roller coaster starts from rest at point A. Rank these quantities from greatest to least at each point: (a) speed, (b) kinetic energy, (c) potential energy.

2. A car with a mass of 1000 kg moves at 20 m>s. Show that the braking force needed to bring the car to a halt in 10 s is 2000 N.