Physics (AS & A Level) · May / June 2016 · Paper 11 · Question 11
9702Momentum and Newton’s laws of motion
The diagram shows a man standing on a platform that is attached to a flexible pipe. Water is pumped through the pipe so that the man and platform remain at a constant height. The resultant vertical force on the platform is zero. The combined mass of the man and platform is 96 kg. The mass of water that is discharged vertically downwards from the platform each second is 40 kg. What is the speed of the water leaving the platform?
- A2.4 m s–1
- B6.9 m s–1
- C24 m s–1
- D47 m s–1
As printed in the paper
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Correct answer: C. 24 m s–1
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