An acrobat on skis starts from rest 50 m above the ground on a frictionless track and flies off the track at a 45° angle above the horizon and at a height of 10 m. disregarding air resistance, what is the skier’s speed when leaving the track?

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

In a system with only a single force acting upon a body, what is the relationship between the change in kinetic energy and the work done by the force? answers: work is equal to the change in kinetic energy. work depends on the square of the change in potential energy. work is equal to the negative of the change in kinetic energy. work is equal to the square of the change in kinetic energy

Alarge cruise ship of mass 7.00 ✕ 107 kg has a speed of 11.6 m/s at some instant. (a) what is the ship's kinetic energy at this time? (b) how much work is required to stop it? (give the work done on the ship. include the sign of the value in your answer.) (c) what is the magnitude of the constant force required to stop it as it undergoes a displacement of 3.00 km?