Problem: A 36.0 g ball is fired horizontally with initial speed v0 exttip{v_{ m 0}}{v_0} toward a 110 g ball that is hanging motionless from a 1.10 m-long string. The balls undergo a head-on, perfectly elastic collision, after which the 110 g ball swings out to a maximum angle of exttip{heta _{ m max}}{theta_max}52.0°. What was v0?

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A 36.0 g ball is fired horizontally with initial speed v0 toward a 110 g ball that is hanging motionless from a 1.10 m-long string. The balls undergo a head-on, perfectly elastic collision, after which the 110 g ball swings out to a maximum angle of 52.0°. What was v0?

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Based on our data, we think this problem is relevant for Professor Darnton's class at GT.