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22 September, 23:33

Mary is at the top of a 25 m steep slide. She is then pushed and starts accelerating at a rate of 4.3 m/s"2. How long will it take her to get to the bottom of the slide?

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  1. 23 September, 02:08
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    Answer

    3.4 s

    Explanation

    The question can be solve by using the 2nd Newton's law of motion.

    s = ut + 1/2at²

    Before she is pushed, the initial velocity is zero.

    u = 0

    Now the equation becomes

    s = 0 + 1/2at²

    s = 1/2at²

    25 = 1/2 * 4.3 * t²

    50 = 4.3t²

    t² = 50/4.3

    = 11.628

    t = √11.628

    = 3.4 s
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