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    snafu123's Avatar
    snafu123 Posts: 2, Reputation: 1
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    #1

    Aug 22, 2013, 04:17 PM
    Snafu123
    A car accelerates from a standing start at a constant 1 gravity. How long does it take to go a ¼ mile?
    What would the speed be at the end of the ¼ mile?
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Aug 22, 2013, 04:35 PM
    Memorize and use these formulas:

    For the first question:
    .
    Here x_0 = 0, v_0=0, x = 1/4 mile, a = 1g; solve for t. Be careful to use consistent units.

    For the second:
    .
    Here you know a and d, and v_o = 0, so you can solve for v_1.

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