Answer to Question #19918 in Mechanics | Relativity for sakinah

Question

A 24.0 g ball is fired horizontally with initial speed toward a 100 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 100 g ball swings out to a maximum angle = 52.0.
What was the initial velocity ?