Maintain traffic !
You are driving along the street at the speed limit (35mph) and 50 meters before reaching a traffic light you notice it becoming yellow. You accelerate to make the traffic light within the 3 seconds it takes for it to turn red. What is your speed as you cross the intersection? Assume that the acceleration is constant and that there is no air resistance.
The answer is 40.
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1 solution
please do indicate that the unit must be in mph, because others may assume it to be in m/s (this is due to the fact that in the calculation, we are to convert 35mph first to m/s). :)