- #1

Kennedy111

- 27

- 0

## Homework Statement

Mass of Cue stick : 595 g

Mass of White Ball: 170 g

Mass of Black Ball: 155 g

On the pool table, the white ball bounces off of the black ball and moves in the direction opposite to its original direction. If the speed of the white ball immediately after the collision is 3.13 m/s, then the speed of the black ball immediately after the collision is...?

## Homework Equations

Σpi = Σpf

p =mΔv

## The Attempt at a Solution

0 = (170g)(-3.13m/s) + (155g)(v)

532.1 = 155g(v)

v = 3.43 m/s

This is NOT the correct answer. Apparently the initial velocity of the white ball is not 0, but instead 3.13 m/s... I'm not sure how I find out what the final velocity of the white ball is, and without that information I don't know how to find the final velocity of the black ball... please help..