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## Homework Statement

A 0.440 kg block is attached to a horizontal spring that is at its equilibrium length, and whose force constant is 23.0 N/m. The block rests on a frictionless surface. A 5.90*10^-2 wad of puddy is thrown at the block, hitting it with a speed of 2.50 m/s and sticking. How far does the putty block system compress the spring?

## Homework Equations

I wrote down the equation for springs. U= 0.5kx^2

## The Attempt at a Solution

I have drawn a picture and figured out the momentum of the puddy onto the block, but not sure what to do after that.