Asking again coz wth SOS PLS HELP the mass of a car is 1000kg and it accelerates at 3m/s^2 in the northern direction. If the mass is doubled, what magnitude should be the exerted force be to get the same acceleration​

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.