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The stopping sight distance for a car traveling at 50 mph is 461 ft (including both perception-reaction distance and braking distance). The perception-reaction time is 2.5 sec. If a car traveling at 60 mph is to stop in the same distance with the same deceleration, what is most nearly the required perception-reaction time

Respuesta :

lublana

Answer:

2.08 s

Explanation:

We are given that

Speed,v=50mph=73.3ft/s

1 mile=5280 feet

1 hour=3600 s

Distance,d=461 ft

t=2.5 s

v'=60 mph=88 ft/s

We have to find the perception reaction time.

Perception reaction distance=[tex]d_p=vt=73.3\ti es 2.5=183.25 feet[/tex]

[tex]d_p=d'_p[/tex]

[tex]d'_p=v't[/tex]

[tex]t'=\frac{183.25}{88}=2.08 s[/tex]

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