From Coulomb's Law: Electric force is:
A. directly proportional to distance.
B. inversely proportional to distance.
C. directly proportional to the square of the distance.
D. inversely proportional to the square of the distance.

D

Explanation:

Coulomb's law states that the electrical force between two charged objects is directly proportional to the product of the quantity of charge on the objects and inversely proportional to the square of the separation distance between the two objects.

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what was the acceleration of the 2 kg cart?

⇒ 16.0 cm/s2

what was the acceleration of the 4 kg cart?

⇒ 8.1 cm/s2

what was the acceleration of the 6 kg cart?

⇒ 5.3 cm/s2