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## Homework Statement

A spring with spring constant K is compressed by x and used to shoot a ball of mass m into an initially stationary block also of mass m. The ball sticks to the block after the collision. Calculate the final velocity of the ball + block.

## Homework Equations

## The Attempt at a Solution

F=kx

m1v1 + m2v2 = (m1+m2)v2

1/2mv^2 + 1/2kx^2 = (m1+m2)v2

v2 = 1/4v1^2 + kx^2/4m

i think my value for the spring's energy is wrong and that messed everything up??