How do chemical equations model the law of conservation of mass?

Avery hard rubber ball (m = 0.5 kg) is falling vertically at 4 m/s just before it bounces on the floor. the ball rebounds back at essentially the same speed. if the collision with the floor lasts 0.05 s, what is the average force exerted by the floor on the ball?

The transfer of heat through the movement of a gas or liquid a. convection b. conduction c. radiation

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?