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A gun that fired charged particles

  • Thread starter Dart82
  • Start date
57
0
1. Homework Statement
A gun that fires charged particles accelerates a 5-μC charge from rest through a potential difference of 50,000 V. The particle has a mass of 0.025 kg. With what speed does it leave the gun?


2. Homework Equations
EPE = KE
(1/2)qV = (1/2)mv^2 , solve for v^2



3. The Attempt at a Solution
EPE = (1/2) x (5^-6 Coulombs) x (50,000 Volts)

KE = (1/2) x ( 0.025kg) x (v^2)

where the problem lies:
When i solve for velocity i get 3.16 m/s, however the answer my teacher gave to this problem was 4.5 m/s. Am i missing something here??
 

Answers and Replies

berkeman
Mentor
56,114
6,147
Are you sure that the electrical potential energy is (1/2)qV?
 
57
0
ahhh...nothing like a good 'ole misprint on the formula sheet to trip you up. thanks for the insight!!
 

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