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Question: a 47 g ball is fired horizontally with initial speed...

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A 47 g ball is fired horizontally with initial speed v0toward a 110 g ball that is hanging motionless from a 1.1 m -long string. The balls undergo a head-on, perfectly elastic collision, after which the 110 g ball swings out to a maximum angle θmax = 52 ∘

What was v0?

Express your answer using two significant figures.

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