A small object with mass m = 0.0900 kg moves in the xy-plane. The only force on the object is a conservative force that has the potential-energy function U(x,y) = -xxx2+ Bys, where x - 2.00 J/m2 and B - 0.300 J/ms. The object is released from rest at x = 0.0 m and y = 0.0 m a. What is the speed of the object when it is at x = 4.00 m, y = 0.30 m? b. What is the acceleration (in unit vectors) of the object when it is at x - 4.00 m, y = 0.30 m