A small block with mass 0.0400kg is moving in thexy-plane. The net force on the block is described by the potential- energy function U(x,y)= (5.80J/m^2 )x^2-(3.45J/m^3 )y^3.
1. What is the magnitude of the acceleration of the block when it is at the point x= 0.39m , y= 0.51m ?
2. What is the direction of the acceleration of the block when it is at the point x= 0.39m , y= 0.51m ?