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A 29.0 g ball is fired horizontally with initial speed v0 toward a 110 g ball...

A 29.0 g ball is fired horizontally with initial speed v0 toward a 110 g ball that is hanging motionless from a 1.00 m -long string. The balls undergo a head-on, perfectly elastic collision, after which the 110 g ball swings out to a maximum angle ?max = 52.0 ?. What was v0?

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