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While you are driving at a constant speed of 30 mph (or 44 ft/s), what distance do you travel if it took you 0.8 s to realize that you have to slam on the brakes to avoid hitting a person that runs onto the road in front of you?

Respuesta :

Answer:

[tex]d>10.72896\ m[/tex]

Explanation:

Given:

  • initial speed of the car, [tex]u=30\ mph=13.4112\ m.s^{-1}[/tex]
  • time taken to realize the need of braking, [tex]t=0.8\ s[/tex]

Distance travelled during the time span:

[tex]d=u.t[/tex]

[tex]d=13.4112\times 0.8[/tex]

[tex]d=10.72896\ m[/tex]

Actually the distance travelled before stopping the car will be greater than this distance, because after the application of brakes the car will take some time to come to rest.

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