When something is it is not moving if this is the topic is wrong i did no what to put for this type of science. i will give 100 pts for the perso who answer it first i need it for a test plz hurry its due tomorrow.

Amira pulls a 3 pound wagon 4 feet. how much work has she done?

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value

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?