What is the amount of work required to increase a 1100 kg car's speed from 20.0 m/s to 50.0 m/s?

World class speed skaters can skate a 3,000-m course in about 4 minutes.what is their average speed for this course? a. 12.5 m/sb. 1.33 m/sc. 1.25 m/sd. 13.3 m/s

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost

Auniform crate c with mass mc is being transported to the left by a forklift with a constant speed v1. what is the magnitude of the angular momentum of the crate about point a, that is, the point of contact between the front tire of the forklift and the ground