I have a problem where v_0 is 3.5m/s and theta is 32*. A block goes up a frictio

Question

I have a problem where v_0 is 3.5m/s and theta is 32*. A block goes up a frictionless inclined plane and then comes back down. i know that you have to set up an x-y axis where the normal force is your y-axis in the positive direction. then the question says "what is the particles speed when it gets back to the bottom?". i know that you are supposed to use the equation v=v_0+at. i know what 'a' and 't' is. when i look at the solutions manual it is saying that v_0 is -3.5 when you plug it in and i dont understand why it would be negative.

Explanation / Answer

up the incline is taken as +ve direction so when block comes down its velocity is down the incline thats why it is taken -ve.

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