Your little sister (mass 25 kg) is sitting in her little red wagon (mass 8.5 kg) at rest. You begin pulling her forward, accelerating her with a constant force for 2.35 s to a speed of 1.8 m/s. Calculate the impulse you imparted to the wagon and its passenger
75.2 N. s
80.4 N. s
25.3 N. s
60.3 N-s

Could someone . i have tried to solve myself but my calculation is off

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?

Which of these has some mechanical energy? a. an atom b. heat inside earth c. a book on a shelf d. the fire from a lit match