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.
The Attempt at a Solution
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??