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## Homework Statement

Two insulating spheres have radii 0.300 cm and 0.500 cm, masses 0.450 kg and 0.700 kg, and uniformly distributed charges of -2.00 µC and 3.00 µC. They are released from rest when their centers are separated by 1.00 m.

(a) How fast will each be moving when they collide? (Hint: Consider conservation of energy and of linear momentum.)

## Homework Equations

F = k

_{e}q

_{1}q

_{2}/r

^{2}

v = at + v

_{0}

Δs = v

_{0}t + .5at

^{2}

## The Attempt at a Solution

I found the electrostatic force on the objects. Since they have opposite charges, I know that they move towards each other. I found their accelerations by dividing by their respective masses, and then plugged those into some of the kinematics equations to find the final velocity.

I can see that my methods/assumptions are wrong, I'm just not exactly sure about how to go about this problem.