A ball is stationary on the ground. A boy kicks it. The boy’s boot remains in contact with the ball for $0.040\,\text{s}$. The mean force on the ball is $200\,\text{N}$. The ball leaves the boy’s boot at a speed of $20\,\text{m s}^{-1}$. Which row gives the impulse of the boot on the ball and the mean acceleration of the ball?
- Aimpulse $8\,\text{N s}$, average acceleration $0.8\,\text{m s}^{-2}$
- Bimpulse $8\,\text{N s}$, average acceleration $500\,\text{m s}^{-2}$
- Cimpulse $5000\,\text{N s}$, average acceleration $0.8\,\text{m s}^{-2}$
- Dimpulse $5000\,\text{N s}$, average acceleration $500\,\text{m s}^{-2}$