Atennis pro throws a tennis ball at a speed of 204 km/hr. a) the tennis racquet contacts the 0.057 kg ball for 0.25 s, therefore what is the average force on the ball?
b) the ball doesn't get slowed down by drag or friction, and the opponent returns the ball at a speed of 80 km/hr. assuming a contact time of 0.25 s, what average force is applied to the ball by the opponent’s racquet?

12.92 N, 17.98 N

Explanation:

Given

Speed of ball

mass of ball (m)=0.057 kg

time (t)=0.25 s

(a)Average Force(F)

=12.92 N

(b)Intial velocity(u)

Final velocity (v)

Average Force

F=17.984 N

energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. do not understand what you are asking but hope this

conduction, convection, radiation