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## Homework Statement

A 2.10-kg block is suspended from a spring with a spring constant of 280.0 N/m. A 0.070-kg bullet is fired into the block from directly below with a speed of 220.0 m/s and is embedded in the block. Find the amplitude of the subsequent motion.

-What fraction of the original kinetic energy of the bullet appears as mechanical energy in the system of block-spring-bullet?

## Homework Equations

we are learning about the oscillations and energy. For this question I'm thinking I would need to use E= Kinetic energy + potential energy... (1/2)KA

^{2=(1/2)mv2 + (1/2)Kx2 but I don't know what to do to get started, I am soo lost! The Attempt at a Solution}