A particle (q = +5.0 ?C) is released from rest when it is 2.0 m from a charged particle which is held at rest. After the positively charged particle has moved 1.0 m toward the fixed particle, it has a kinetic energy of 50 mJ. What is the charge on the fixed particle?
A. ?2.2 ?C
B. +6.7 ?C
C. ?2.7 ?C
D. +8.0 ?C
E. ?1.1 ?C
Answer: A
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