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Math Help - acceleration of car is required to be calculated

  1. #1
    Member moonnightingale's Avatar
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    acceleration of car is required to be calculated

    If a car required 18 seconds to stop to zero speed while it was moving at 50 Km/h, how can we calculate the acceleration or deceleration of car during crash
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  2. #2
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    e^(i*pi)'s Avatar
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    Re: acceleration of car is required to be calculated

    Quote Originally Posted by moonnightingale View Post
    If a car required 18 seconds to stop to zero speed while it was moving at 50 Km/h, how can we calculate the acceleration or deceleration of car during crash
    a = \dfrac{v-u}{t}

    You know v, u and t. It is perfectly acceptable for a to be negative.
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  3. #3
    Member moonnightingale's Avatar
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    Re: acceleration of car is required to be calculated

    the answer coes to be -0.77 m/sec
    is it correct
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    e^(i*pi)'s Avatar
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    Re: acceleration of car is required to be calculated

    Quote Originally Posted by moonnightingale View Post
    the answer coes to be -0.77 m/sec
    is it correct
    EDIT: Your magnitude (-0.77) is correct but your units are not

    Remember that acceleration is measured in \text{m}\cdot \text{s}^{-2}
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