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During a circus performance, a 64-kg human cannonball is shot out of an 17-m-long cannon. If the human cannonball spends 0.99 s in the cannon, determine the average net force exerted on him in the barrel of the cannon.

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L=a•t²/2 => a=2•L/t².
F=m•a=2•L•m/t².

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