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## Homework Statement

A 10.1 g bullet is fired horizontally into a

44.1 g wooden block that is initially at rest on

a rough horizontal surface and connected to a

massless spring of constant 97.8 N/m.

If the bullet-block system compresses the

spring by 0.441 m, what was the speed of

the bullet just as it enters the block? The

acceleration of gravity is 9.8 m/s

2

. Assume

that the coefficient of kinetic friction between

the block surface is 0.554.

Answer in units of m/s.

## Homework Equations

The equation our teacher gave us to solve it is: 1/2 mv^2= 1/2kx^2 + Fd

but I've used the equation and it hasn't worked for me.[/B]

## The Attempt at a Solution

Using the equation above. Is the equation right?[/B]