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## Homework Statement

Kevin has a mass of 84.2 kg and is skating with in-line skates. He sees his 23.2-kg younger brother up ahead standing on the sidewalk, with his back turned. Coming up from behind, he grabs his brother and rolls off at a speed of 1.74m/s. Ignoring friction, find Kevin's speed just before he grabbed his brother.

## Homework Equations

V= d/t ?

I have no idea how to solve this eqn!

The only eqn i have for perfectly inelastic collision involves center of mass.

PLEASE HELP!!