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## Homework Statement

The figure shows two 5.0 g spheres suspended from 1.0-m-long threads. The spheres repel each other after being charged to +91 nC. What is the angle θ ?

## Homework Equations

I was thinking momentum and/or kinetic energy equations.

k = 1/2 mv^2

p = mv

F = ma

## The Attempt at a Solution

Answer is: 4.1 degrees

I am not sure how to go about this problem other than from the equations I have already given.