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.
The Attempt at a Solution