Hi, could someone help me with part a, please? Thank you!

(10%) Problem 6: Suppose your friend claims to have discovered a mysterious force in nature that acts on all particles in some region of space. He tells you that the force is always pointed away a definite point in space, which we can call the force center. The magnitude of the force turns out to be proportional to B/r, where r is the distance from the force center to any other point. Your friend says that it has been determined that the constant of proportionality has been determined to be B = 7 (in units to be determined later), so that the magnitude of the force on a particle (in newtons) can be written as 7/r, when the particle is at a distance r from the force center. 33% Part (a) Write an expression for the potential energy Up of a particle when it is at a distance D from the force center, in terms of B and D, where B is the constant of proportionality. Assume the potential energy to be zero when the particle is at infinity. Grade Summary UD = B/8 D21 Deductions 0% Potential 100% 7 8 9 HOME Submissions Attempts remaining: 995 B C D 5 6 (0% per attempt) g h 3 detailed view 1% k m n END 0% P S U VOl BACKSPACE DEL CLEAR AWN 0% Submit Hint Feedback I give up