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**1. Homework Statement**

The potential energy of a system of two particles separated by a distance r is given by U(r) = (A)/(r^4), where A is a constant. Find the radial force that each particle exerts on the other. (Use A and r as appropriate in your equation.)

**2. Homework Equations**

F=-dU/dx

U is potential energy

**3. The Attempt at a Solution**

i figured out the antiderivative of U(r) is -(A)/(3*r^(3)) but it isnt the correct answer.

what else do u need to do besides the antiderivative which is equal to force. since it is 2 particles should i divide the U(r) funciton by 2?

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