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March 25, 2017

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A ball is thrown straight up that it reaches a max height of 30 meter. How long did it take the ball to go up? How fast was it going when it was 10 meter high from the ground?

  • Physics - ,

    (1/2) m Vi^2 at bottom = m g h at top
    Vi^2 = 2 g h = 2 * 9.8 * 30
    Vi = 24.2 m/s

    v = Vi - g t
    0 = 24.2 - 9.8 t
    t = 2.47 s

    (1/2) m Vi^2 = (1/2) m v^2 + m g (10)
    24.2^2 = v^2 + 98*2
    v = 19.7 m/s

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