Hai quả cầu kim loại mang các điện tích lần lượt là q1 q2 cho tiếp xúc nhau. Sau đó tách chúng ra thì mỗi quả cầu mang điện tích gì

Ablue car pulls away from a red stop-light just after it has turned green with a constant acceleration of 0.5 m/s 2 . a green car arrives at the position of the stop-light 6.5 s after the light had turned green. if t = 0 when the light turns green, at what time does the green car catch the blue car if the green car maintains the slowest constant speed necessary to catch up to the blue car? answer in units of s.