Two 1 kg blocks are about to slide down frictionless inclined planes as shown below. each block is 1 m high. which statement is correct?

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)

Most short-period comets do not have randomly oriented orbits because

What ia the energy of an object because of its potential and kinetic energies