Help! A ball is +8 m from the origin and moves -13 m. What is the ball's final position?
A. 21 m
B.-21 m
C. 55 m
D. -5 m

D. -5

It is -5 because you subtract 13 from 8 to get to the answer.

Q1 = 23199 pC

Q2 = 12210 pC

Explanation:

C1 = 5700 pF = 5700 x 10^-12 F

C2 = 3000 pF = 3000 x 10^-12 F

Connected in series

V = 9V

Let the equivalent capacitance is C.

C = C1 x C2 / (C1 + C2) = 5700 x 3000 / (5700 + 3000) = 1965.5 pF

Let the charge is Q.

Q = C x V = 1965.5 x 10^-12 x 9 = 17689.65 x 10^-12 C

The total charge on both the capacitors = 2 x 17689.65 x 10^-12 C

                                                                   = 35379.3 x 10^-12 C

Equivalent parallel capacitance, Cp = C1 + C2 = 5700 + 3000 = 8700 pF

Voltage = V = total charge / Cp = 35379.3 / 8700 = 4.07 V

Charge on 5700 pF, Q1 = C1 x V = 5700 x 4.07 = 23199 pC

charge on 3000 pF, Q2 = C2 x V = 3000 x 4.07 = 12210 pC