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BATBLady

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**Inelastic Collision, only masses known need help**

## Homework Statement

A projectile (mass = 0.28 kg) is fired at and embeds itself in a target (mass = 2.35 kg). The target (with the projectile in it) flies off after being struck. What percentage of the projectile's incident kinetic energy does the target (with the projectile in it) carry off after being struck?

## Homework Equations

m

_{1}V1

_{i}+m

_{2}V2

_{i}=m

_{1}V1

_{f}+m

_{2}V2

_{f}

## The Attempt at a Solution

I just don't know how to solve without velocities. I know the KE+PE must equal the final KE+PE. No idea how to get percentages with this information.

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