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vitfil [10]
4 years ago
5

Why do streets and highways have speed limits rather than velocity limits?

Physics
1 answer:
andrew11 [14]4 years ago
8 0

They actually DO have velocity limits. There are legal restrictions on both speed and direction.

-- Speeds are limited according to the black numbers on white signs that you see on sign-posts everywhere.

-- Directions are limited by the layout of the pavement and curbs on all the highways, avenues, roads, boulevards and streets, as well as the countless signs that say "One Way", "No Left Turn", "Keep Right", "Keep Left", etc. Violate one of these, and you get nailed as sure as if you had exceeded a posted speed limit.

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Explanation:

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According to recent typical test data, a Ford Focus travels 0.240 mi in 19.3 s, starting from rest. The same car, when braking f
Anit [1.1K]

Answer:

Explanation:

a )

While breaking initial velocity u = 62.5 mph

= 62.5 x 1760 x 3 / (60 x 60 )  ft /s

= 91.66 ft / s

distance trvelled s = 150 ft

v² = u² - 2as

0 = 91.66²  - 2 a x 150

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time = 19.3 s

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c )

If distance travelled s = .25 mi

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= .000644

v = .025 mi / s

= .0025 x 60 x 60 mi / h

= 91.35 mph .

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v = u - at

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t = 3 sec approx .

4 0
3 years ago
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