posted by ZAC .
A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of +18.0 m/s, while the exiting water stream has a velocity of -18.0 m/s. The mass of water per second that strikes the blade is 69.0 kg/s. Find the magnitude of the average force exerted on the water by the blade.