Which would be more difficult to stop (greatest momentum),a .44 magnum bullet with 4kg mass and a velocity of 16,500 m/s or a 2,000 kg truck moving with a velocity 35 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?