A 9 kg ball of clay traveling at 9 m/s collides with a 22 kg ball of clay traveling in the same direction at 1.3 m/s. What is their combined speed if the two balls stick together when they
touch?

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