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## Homework Statement

A 5.00 g bullet moving with an initial speed of 410 m/s is fired into and passes through a 1.00 kg block. The block, initially at rest on a frictionless, horizontal surface, is connected to a spring of force constant 965 N/m.

1. If the block moves 5.20 cm to the right after impact, find the speed at which the bullet emerges from the block.

wrong check mark

## Homework Equations

p=mv (momentum)

(1/2)mv^2 (kinetic energy)

(1/2kx^2 (elastic potential energy of a spring, where x is the distance the spring is compressed)

-Energy is always conserved in a isolated system

-Momentum is always conserved in a closed isolated system

## The Attempt at a Solution

I am having a hard time grappeling what type of problem this is. A perfectly inelastic collision? But the bullet then exits the block...so a little tricky. Here is my attempt:

(1/2)mv^2(initial)=(1/2)mv^2 (final) - (1/2)kx^2

solving for v (final) i got 28.4 m/s