a. If only an external force can change the velocity of a body, how can the internal force of the brakes bring a moving car to rest?

b. A car hurtles off a cliff and crashes on the canyon floor below. Identify the system in which the net momentum is zero during the crash.

Answer rating: 100% (QA)

a Answer The internal forces of the brake come into action only when the driver put his foot on ... View the full answer