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An attack helicopter is equipped with a 20-
mm cannon that fires 61.6 g shells in the
forward direction with a muzzle speed of
585 m/s. The fully loaded helicopter has a
mass of 4890 kg. A burst of 208 shells is fired
in a 2.32 s interval.
What is the resulting average force on the
helicopter?
Answer in units of N



By what amount is its forward speed reduced?
Answer in units of m/s

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