Car 1 is going to run into a stationary car 2 with a velocity of 16.1 m/s. If car 1 has a mass of 19.5 kg and car 2 has a mass of 7.7 kg, what is the final velocity of car 2 if car 1 has a final velocity if 3.5 m/s?

Aplayground merry-go-round has a radius of 4.6 m and a moment of inertia of 200 kg-m2 and turns with negligible friction about a vertical axle through its center. a child applies a 26.0 n force tangentially to the edge of the merry-go-round for 15.0 seconds. if the merry-go-round is initially at rest, how much work did the child do on the merry-go-round?