The measure of the average kinetic energy of a substance is called

A2 kg ball travellng to the right with a speed of 4 m/s collidees with a 5 kg ball traveling to the left with a speed of 3 m/s. take right to be the positive direction. what is the total momentum of the two balls before they collide? what is the total momentum of the two balls after they collide?

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain