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## Homework Statement

A snooker ball of mass 0.350kg hits the side of a snooker table at right angles, and bounces off also at right angles. If its speed before collision is 2.8ms^-1 and its speed after is 2.5ms^-1, calculate the change in its momentum.

(The answer to the question is not 0.105kg ms^-1)

## Homework Equations

p = mv (well, that's what I've tried answering it with)

## The Attempt at a Solution

I'm assuming my method is flawed, but I thought it might be worth using pythagoras to work out the actual (?) velocity.

I got 3.75 but if you do 3.75*0.35 i reach 1.3 which according to the answers in the back of the book are incorrect.

Could someone enlighten me please? I'm really stumped.

Thanks