An electron starts from rest 29.5 cm from a fixed point charge with Q = -4.00 nC How fast will the electron be moving when it is very far away? Express your answer with the appropriate units.
Initial potential energy will be converted to kinetic energy at far point
k*q1*q2/r^2 = 0.5*m*v^2
Here:
q1=charge of electron =-1.6*10^-19 C
q2 = -4*10^-9 C
r = 29.5 cm = 0.295 m
m=mass of electron = 9.1*10^-31 Kg
(9*10^9)*(1.6*10^-19)*(4*10^-9) / (0.295)^2 = 0.5*(9.1*10^-31)*v^2
v=1.21*10^7 m/s
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