A footballer kicks a football that is at rest. His foot stays in contact with the ball for $0.050\,\text{s}$. The mass of the ball is $0.40\,\text{kg}$. The speed of projection of the ball is $25\,\text{m s}^{-1}$. What is the average force exerted on the ball by his foot?
- A$0.32\,\text{N}$
- B$0.50\,\text{N}$
- C$200\,\text{N}$
- D$1300\,\text{N}$