A jet of water issues from a nozzle with a velocity 20 m/s on a flat plate moving away from it at 10 m/s. The cross-sectional area of the jet is 0.01 m². The force developed on the plate is
- A. 1000 N
- B. 100 N
- C. 10 N
- D. 2000 N
Answer: A. 1000 N
Explanation: F = rho A (V - u)^2 = 1000 * 0.01 * (20 - 10)^2 = 1000 N.