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Punkyc7
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Homework Statement
a steel ball of m mass is fastened to light cord of length L and released when the cord is horizontal. At the bottom if its path the ball strikes a hard plastic block of mass M=4m, initially at rest on a frictionless surface. The collision is elastic. Find the speed of the block immediatey after the collision.
Homework Equations
KE+U+W=KEF+UF
m1v1+m2v2=m1v3+m2v4
The Attempt at a Solution
I get the as speed (v1+4v2-v3)/4 but the book gets 2/5√2gL
If anyone can help it would be much appreciated.
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