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Mastering Physics homework help?

If a car moving at 86.0 takes 300 to stop with uniform acceleration after its brakes are applied, how far will it take to stop under the same conditions if its initial velocity is 43.0 ?

No idea how to approach this, 5 stars show answer and how you got it pretty please.

here are the options

15.0 ft

37.5 ft

75.0 ft

150 ft

Update:

the answer is 75 ft but I don't know how to get to that answer.

1 Answer

Relevance
  • Saj
    Lv 5
    1 decade ago
    Favorite Answer

    x=(0.5)at^2+v0*t

    300=(0.5)at^2+86t

    v=at+v0

    0=at+86

    ------>t=(-86)/a

    put this t in the first equation and find a

    now when u find a do it with 43.

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