Particles q1, q2, and q3 are in a straight line. Particles q1= -28.1 uc, q2= +25.5 uc, and q3= -47.9 uc. Particles q1 and q2 are separated by 0.300 m. Particles q2 and q3 are separated by 0.300 m. What is the net force on q3?

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i just did this and got a 100.