A tennis ball with a mass of $0.060\,\text{kg}$ moves horizontally at a speed of $25\,\text{m s}^{-1}$. It strikes a tennis racket and then rebounds horizontally at a speed of $40\,\text{m s}^{-1}$. The ball remains in contact with the racket for $50\,\text{ms}$. What force is exerted on the ball by the racket?
- A$0.018\,\text{N}$
- B$0.078\,\text{N}$
- C$18\,\text{N}$
- D$78\,\text{N}$