You are driving to the grocery store at 20m/s. You are 110m from an intersection when the traffic light turns red. Assu…
ID: 2128158 • Letter: Y
Question
Q: How far are you from the intersection when you begin to apply the brakes?
Q: What acceleration will bring you to rest right at the intersection?
Q: How long does it take you to stop after the light changes?
What equaation would you use? How would you solve.. explain step by step please
Q: How far are you from the intersection when you begin to apply the brakes?
Q: What acceleration will bring you to rest right at the intersection?
Q: How long does it take you to stop after the light changes?
What equaation would you use? How would you solve.. explain step by step please
Explanation / Answer
1) S1 = v*t= 20*.5 = 10m
S2 = 110-10 = 100m
2) a = v^2-u^2/2S = -20^2 /2*100 =400/200 = -2m/s^2
3) t = v-u/a = 0-20/-2 = 10 s
total time = T = 0.5+10 = 10.5 s
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