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## Homework Statement

Two billiards balls of equal mass move at right angles and meet at the origin of an xy coordinate system. One is moving upward along the y-axis at 2.0 m/s, and the other is moving to the right along the x-axis with speed 3.7 m/s. After the collision( assumed elastic), the second ball is moving along the positive y axis. What is the final direction of the first ball, and what are the two speeds?

## Homework Equations

it is elastic so

P

_{1}+P

_{2}=P

_{1}final+P

_{2}final

mass is constant so it cancels

V

_{1}+V

_{2}=V

_{1}final+V

_{2}final

## The Attempt at a Solution

i got 5.7=V

_{1}final+V

_{2}final