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## Homework Statement

I am not sure wether I should take the value of velocity as a negative or positive in momentum questions.

A cart (cart 1) of mass 5kg is travelling to the right with a velocity of 5m/s and another cart (cart 2) of mass 5kg is travelling to the left with a velocity of 1m/s. After collision cart 1 is travelling to the right with a velocity of 1m/s. Cart 2 is also travelling to the right.

I need to find the velocity of cart 2 after collision. I basically need to understand when to take the velocity as a negative.

## Homework Equations

m1u1+m2u2= m1v1+m2v2

## The Attempt at a Solution

(5x5)+(5x-1)= (5x1)+(5v)

25-5=5+5v

20-5=5v

v= 3m/s

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