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Electric Fields and Final Velocity of point particle question? Electric Fields and F 
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#1
Feb1012, 06:30 PM

P: 13

1. The problem statement, all variables and given/known data
A fixed charge Q= +3.65 µC is held fixed at the origin of an xy plane. A second charge q= +5.11 µC is released from rest at the xy coordinate of (+1.15 m, +0.810 m). a) (a) If the mass of q is 2.90 g, what is its speed when it moves infinitely far from the origin? (b) At what distance from the origin does q attain half the speed it will have at infinity*? (*Please note where most of the energy exchange occurs!)  2. Relevant equations Ei=Ef KQq/r=Fe=qV 1/2mv^2 3. The attempt at a solution I solved for a) and got 9.07202 m/s Can't seem to figure out way to do b. Initially I just took 1/2 the velocity I got in a), plugged it into the equation KQq/r=1/2mv^2 to solve for a n R, but that's wrong. Any help is appreciated. 


#2
Feb1012, 08:23 PM

P: 1,376

What did you get?



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