How to find deceleration up incline

[xwalsh]

Homework Statement

Use Newton's Laws to find the speed of the block when it returns to its original location.

Relevant Equations

a = g sin theta - u g cos theta

Basically the problem is giving me an initial velocity to start with it goes up the incline before it comes back down. I know how to do everything else in the problem but solve for the initial acceleration up the incline. What would I need to calculate to solve this?

 

[gneill]

Hi xwalsh, Welcome to Physics Forums.

Have you drawn a Free Body Diagram (FBD) for the block to show the forces acting? What does it tell you about the net force acting on the block?

 

[haruspex]

Relevant Equations:: a = g sin theta - u g cos theta

That equation does not apply throughout the sequence. Rather than use it blindly, follow @gneill's advice to draw FBDs, but consider the up and down phases separately..