A body of mass $60\text{ kg}$ slows down from $50\text{ m s}^{-1}$ to $20\text{ m s}^{-1}$ while a resultant force of $300\text{ N}$ is applied to it. How long does this force act for?
- A$0.071\text{ s}$
- B$0.17\text{ s}$
- C$6.0\text{ s}$
- D$14\text{ s}$