4. Car A is standing at red traffic light. Just as the light turns green car B travelling at a constant velocity of 14 m. s- passes car A, which accelerates uniformly at 2.5 ms-2 to a velocity of 18 m. s-1 and then
travels at a constant velocity.

4.2 How long does it take car A to reach a velocity of 18 m. s-1

4.3 Which car is ahead and by how much, when car A reaches a velocity of 18 m. s-1

4.4 How long does it take for the cars to draw level?
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t = 7.2 s, B by 36 m, t = 16.2 s from green light.

Explanation:

4.2  18 m/s / 2.5 m/s² = 7.2 s

dB = 14(7.2) = 100.8 m

dA = ½(2.5)7.2² = 64.8

Car B is ahead by 100.8 - 64.8 = 36 m

36 m / (18 - 14 m/s) = 9 s

t = 9 + 7.2 = 16.2 s

i just did an experiment like this in my science class. also the answer is yes, it will get separated because they are two opposites meaning if they are opposite they can not attract.

hope this .!

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this