Q1. A bumper car with mass m1 = 108 kg is moving to the right with a velocity of v1 = 4.6 m/s. A second bumper car with mass m2 = 98 kg is moving to the left with a velocity of v2 = -3.5 m/s. The two cars have an elastic collision.
Suppose the surface is frictionless. What is the final velocity of car 2 in the ground (original) reference frame?
Q2. A 60kg bicyclist rides his 7.8kg bicycle with a speed of 16m/s. How much work must be done by the brakes to bring the bike and rider to a stop?