A Particle (Q = +5 $\mu$ C)is Released from Rest When It Is 2

Multiple Choice

A particle (q = +5.0 $\mu$ 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 $\mu$ C
B) +6.7 $\mu$ C
C) -2.7 $\mu$ C
D) +8.0 $\mu$ C
E) -1.1 $\mu$ C