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Math Help - Motion

  1. #1
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    Exclamation Motion

    Hello.

    How exactly do I do this???

    A ball is thrown vertically upwards at 20 m/s^2. Take g =10m/s, ignore air resistance, take upwards as positive and use the ground as the origin of displacement - the equation of motion is then acceleration = -10. Show that v^2 = 400 - 20x and find the max. height.
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  2. #2
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    check out suvat equations Equations of motion - Wikipedia, the free encyclopedia

    look espesically at v^2 = u^2 + 2as

    give it a go and post back if you get stuck
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  3. #3
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    Exclamation

    Ummm i have no idea how to get the maximum height. am i meant to equate v = 0 because i get the answer of x=20 BUT i can't prove it's a maximum
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  4. #4
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    You have proved it by taking final speed as 0. It cannot go any higher if it has no velocity!
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