Physics Stop light problem
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Physics Stop light problem

[From: ] [author: ] [Date: 11-09-04] [Hit: ]
=>0 = (20)^2 - 2 x 3.=>s2 = 60.=>Total distance = 60.06 + 5 = 65.=>as 65.=>He will stop in time.......
An inattentive driver is traveling 20.0 m/s when he notices a red light ahead. His car is capable of decelerating at a rate of 3.33 m/s^2 .

If it takes him 0.250s to get the brakes on and he is 78.0m from the intersection when he sees the light, will he be able to stop in time?

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distance traveled in response time(s1) = u x t1 = 20 x 0.25 = 5 m
=>BY v^2 = u^2 + 2as
=>0 = (20)^2 - 2 x 3.33 x s2
=>s2 = 60.06 m
=>Total distance = 60.06 + 5 = 65.06 m
=>as 65.06<78
=>He will stop in time.
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keywords: Stop,problem,light,Physics,Physics Stop light problem
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