Calculating Initial Acceleration of a Charged Particle

[hoseA]

A particle of mass 73 g and charge 38muC is
released from rest when it is 46 cm from a
second particle of charge -17muC.
Determine the magnitude of the initial ac-
celeration of the 73 g particle. Answer in units
of m/s^2.

Well, I used this formula:

k [(q1 * q2) / mr^2)]

8.98755*E9 [(38*17)/ ((73/1000)*(.46^2))]

edit - fixed typo

= 3.7586 * E14

But it's wrong... any help appreciated. Thanks.

 

[Astronuc]

Make sure the units are correct, and square the (46 cm) or 0.46 m if using MKS.

 

[hoseA]

Make sure the units are correct, and square the (46 cm) or 0.46 m if using MKS.

that was a typo on my part... i did indeed square it when i got the wrong answer. Anything look off to anyone?

 

[hoseA]

I'm an idiot. I forgot to multiply the charges by mu(micro) 10^-6.

I got it now. =) Thx astronuc.