A child pulls a sled up a snow-covered hill. The child does 315 J of work on the sled. If the child walks 10.5 m up the hill, how large of a force must the child exert?

Which statements best describe the work of marie and pierre curie? check all that apply. they discovered radioactivity. they came up with the term “radioactivity.” they conducted experiments with uranium-containing minerals and pure uranium. they conducted experiments with uranium-containing minerals and photographic plates. they discovered two new radioactive elements.