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physics

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An automobile starts from rest and 110
ft attains a speed of 30 mi/h. In what time has it traveled this distance and the is the acceleration?

-when is the acceleration of the object positive and negative?

  • physics -

    v=at
    =>a=v/t,
    s=at²/2=v t²/2t=vt/2.
    t=2s/v.

    positive

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