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**What are my units when finding % diff. In kinetic energy?**

## Homework Statement

Phrank (36.4kg) runs at 2.2 m/s and jumps onto a large stationary skateboard (2.3kg) on which Phrancine (22.7kg) is sitting. After the collision, Phrank, Phrancine, and the skateboard move at 1.3 m/s. Find the kinetic energy before and after the collision along with the percent difference.

## Homework Equations

Kinetic energy before equals= 88.1 J

Kinetic energy after= 51.88 J

Percent difference= 88.1-51.88 / (88.1 + 51.88/2 ) x 100 = 51.75 WHAT ARE MY UNITS HERE?

## The Attempt at a Solution

Need help with my units for percent difference! J is no correct!