The diagram depicts a man on a platform connected to a flexible pipe. Water is forced through the pipe so that the man and platform stay at the same height. The net vertical force acting on the platform is zero. The total mass of the man and platform is $96\,\text{kg}$. Each second, $40\,\text{kg}$ of water is expelled vertically downward from the platform. What is the speed of the water as it leaves the platform?
- A$2.4\,\text{m s}^{-1}$
- B$6.9\,\text{m s}^{-1}$
- C$24\,\text{m s}^{-1}$
- D$47\,\text{m s}^{-1}$