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## Homework Statement

Agent Arlene devised the following method of measuring the muzzle velocity of a rifle (the figure below). She fires a bullet into a 4.064-kg wooden block resting on a smooth surface, and attached to a spring of spring constant k = 164.5N/m . The bullet, whose mass is 7.870 g, remains embedded in the wooden block. She measures the maximum distance that the block compresses the spring to be 9.460cm .

(Figure 1)

http://session.masteringphysics.com/problemAsset/1696765/3/Giancoli7.ch11.p22.jpg

What is the speed v of the bullet?

**2. Homework Equations**

v=√(k/m)*x

i tried using that equation and different variations but my mastering physics says i'm incorrect.

v=√(k/m)*x

## The Attempt at a Solution

i tried using that equation and different variations but my mastering physics says i'm incorrect.