A car has moved 6.8 m from when the driver saw the red light to come to a full stop. If the driver was moving with 31.7 m/s when they saw the traffic light, how long did it take for them to come to stop?

i believe that the answer is 4.661764706 seconds

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

read more on -

you go to your settings preference and in the end youll see sth that says "i want to delete my acc" click on it and u'll acc will be deleted but u have to wait.