<span>Electric field is proportional to q/d^2, where q is the magnitude of the charge and d is the distance. Since all the given units are identical, we can just compare their relative magnitudes without calculating for the exact values. A) 3/(0.4)^2 = 18.75 B) 1.5/(0.2)^2 = 37.5 C) 6/(0.4)^2 = 37.5 D) 3/(0.2)^2 = 75 Therefore, choice D has the largest electric field of all. </span>
Since it went 100 meters in 10 seconds, that means it is going 10 meters per second. In 2 seconds, it must have gone 20 meters, if the speed is constant.
