Two particles of equal masses (m = 5.5x10-15 kg) are released from rest with a distance between them is equal to 1 m. if particle a has a charge of 12 μc and particle b has a charge of 60 μc, what is the speed of particle b at the instant when the particles are 3m apart?

To solve this problem it is necessary to resort to the energy conservation equations, both kinetic and electrical.

By Coulomb's law, electrical energy is defined as

Where,

EE = Electrostatic potential energy

q= charge

d = distance between the charged particles

k = Coulomb's law constant

While kinetic energy is defined as

Where,

m= mass

v = velocity

There by conservation of energy we have that

EE= KE

There is not Initial kinetic energy, then

Replacing with our values we have,

Therefore the speed of particle B at the instat when the particles are 3m apart is

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