2. the amount of charge and the distance from the charge determine

a: strength of the negative charge

b: strength of the positive charge

c strength of the electric field

d: static electricity

also tell me why the answer is the answer, i'm having a bit of trouble in science.

A980-kg sports car collides into the rear end of a 2300-kg suv stopped at a red light. the bumpers lock, the brakes are locked, and the two cars skid forward 2.6m before stopping.the police officer, estimating the coefficient of kinetic friction between tires and road to be 0.80, calculates the speed of the sports car at impact. what was that speed?