Determine the electrical force of attraction between two balloons with separate charges of + 3.0 x 10^-9C and 9.0 x 10^-9 C when separated a distance of 76 cm.

A. -4.67x10^-17N
B. 1.40x10^-11N
C. -3.19x10^-9N
D. -4.20x10^-7N

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When considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.

Can anybody me with this? ? (picture included.)