一道英语物理题，英语物理高手进The force acting on an object is given by F(x

一道英语物理题，英语物理高手进
The force acting on an object is given by F(x) = a / (x^2). At x = 5.0m, the force is known to point in the -x direction and have a magnitude of 25(N). Determine the potential energy associated with this force as a function of x, assuming we assign a reference value of -10(J) at x = 2.0m for the potential energy.
答案是，U(x) = [(-0.63 kJ*m)/x] + 0.30 kJ
请高手解答一下，要具体的步骤，好的话，可以再加分，谢谢，最好解释原因下