Q1 a bumper car with mass m1 108 kg is moving to the right, Ask an Expert

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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?

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