Two small identical balls a and b are held a distance r apart on a frictionless surface, with i very large compared with the size of the balls. ball a has a net charge of2q; ball b has a net charge of q. the balls are released at the same instant and begin to move together. which characteristics describe the magnitudes of their accelerations over time? point oequal and increasing ounequal and increasing oequal and decreasing oequal and constant

According to the statement both bodies will experience the same force, by the effect of action and reaction, which would be the same to apply Newton's third law. By the characteristics presented both will have the same mass and the same acceleration. However, considering the sign of their charges, these being the same, they will be repelled from each other. When this movement is generated, the force will begin to decrease as the distance increases and therefore its acceleration will also decrease

Hence the correct option is equal and decreasing.

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.