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## Homework Statement

Two billiard balls of equal mass move at right angles and meet at the origin of an xy coordinate system. Initially ball A is moving upward along the y axis at 1.5 m/s, and ball B is moving to the right along the x axis with speed 4.0 m/s. After the collision (assumed elastic), the second ball is moving along the positive y axis (see figure).

http://www.webassign.net/gianpse4/9-43alt.gif

(a) What is the final direction of ball A?

______° (counterclockwise from the +x axis is positive)

(b) What are their two speeds?

v'A =____ m/s

v'B =____ m/s

## Homework Equations

## The Attempt at a Solution

a) 90+45=135°

b) I am not sure where to begin....I know that KE is conserved, so momentum before is equal to momentum after.

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