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12 years ago
A 1000-kg helicopter hovers over a forest fire and starts to squirt water downward with a speed of 10 m/s at a rate of 40 kg/s. What is the initial upward acceleration on the helicopter when it first starts to release the water?
A) 2.5 m/s2
B) 0.40 m/s2
C) 0.25 m/s2
D) 4.0 m/s2
E) 5.0 m/s2
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12 years ago
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