3. A ski jumper starts at the top of a 400m high hill before skiing down to the bottom. If the ski jumper has a mass of 75kg how much potential energy would they have at the beginning of the their motion? A. 3920 J
B. 735 J
C. 294,000 J
D. 30,000 J

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

The law of the conservation of momentum says that the total momentum of any closed and isolated system cannot

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?