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## Homework Statement

A 4.2 kg object, initially at rest, "explodes" into 3 objects of equal mass. Two of these are determined to have velocities of equal magnitudes (5.0 m/s) with directions that differ by 90 degrees. How much kinetic energy was released in the explosion? (that is what is the energy of the three object systems after the explosions)

## Homework Equations

To be honest, my teacher did not cover this in class so I'm naked in the dark on this one.

## The Attempt at a Solution

Since they are at 90 degrees to eachother, one would be 5 j m/s and the other would be 5 i m/s. I am not sure where to go from there or where the third factors in.