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New user has been reminded to always show their work on schoolwork problems.

- Homework Statement
- A small block with mass 0.0400 kg is moving in the xy-plane. The net force on the block is described by the potential-energy function U(x,y)=(5.80 J/m^2)x^2 − (3.90 J/m^3)y^3. What is the magnitude of the acceleration of the block when it is at the point x=0.39 m, y=0.61 m? What is the direction of the acceleration of the block when it is at the point x=0.39 m, y= 0.61 m?

- Relevant Equations
- Force and potential energy in 3D?

I have no idea how to do this honestly.