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Math Help - suvat question help

  1. #1
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    suvat question help

    I don't know how to work out the problems for this question :/ i've tried for a while now...

    A rock is thrown vertically down from a roof of a 25.0 m high building with a speed of 5m/s.

    a) When does the rock hit the ground?
    b) With what speed does it hit the ground? (Take acceleration due to gravity to be 10.0 m/s/s

    Thanks
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  2. #2
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    Quote Originally Posted by silverfalcon View Post
    I don't know how to work out the problems for this question :/ i've tried for a while now...

    A rock is thrown vertically down from a roof of a 25.0 m high building with a speed of 5m/s.

    a) When does the rock hit the ground?
    b) With what speed does it hit the ground? (Take acceleration due to gravity to be 10.0 m/s/s

    Thanks
    for part (a) ...

    \Delta y = v_{yo} t - \frac{1}{2}gt^2<br />

    -25 = -5t - 5t^2

    solve for t


    for part (b), use the value of t determined in part (a) ...

    v_{yf} = v_{yo} - gt
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