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How far does the particle travel?

  • Thread starter hichangkyu
  • Start date
  • #1

Homework Statement



A charge of -1.8 µC is fixed in place. From a horizontal distance of 0.0450 m, a particle of mass 2.25 10-3 kg and charge -1.7 µC is fired with an initial speed of 65.0 m/s directly toward the fixed charge. How far does the particle travel before its speed is zero?

Homework Equations



q(V) = 1/2mv^2 (??)

The Attempt at a Solution



I'm afraid I'm very lost on this one. I messed around with the equation for collisions a bit but I can't seem to get in the right direction much less get the answer.

I would be grateful if you guys could provide me with some hints to get started >.<
thanks!
 

Answers and Replies

  • #2
tiny-tim
Science Advisor
Homework Helper
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Welcome to PF!

A charge of -1.8 µC is fixed in place. From a horizontal distance of 0.0450 m, a particle of mass 2.25 10-3 kg and charge -1.7 µC is fired with an initial speed of 65.0 m/s directly toward the fixed charge. How far does the particle travel before its speed is zero?
Hi hichangkyu! Welcome to PF! :smile:

Hint: just use KE + PE = constant. :smile:
 
  • #3
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I am having the same problem. I do not get KE + PE = constant?!
 
  • #4
tiny-tim
Science Advisor
Homework Helper
25,832
249
I am having the same problem. I do not get KE + PE = constant?!
Hi nckaytee! :smile:

KE = 1/2 mv2, and PE = … ? :smile:
 

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