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    I think this question is easy but for some reason I can't get my head around it. As far as I know t = 0 here.

    Nathan hits a tennis ball straight up into the air from a height of 1.25m above the ground. The ball hits the ground after 2.5 seconds. Assuming g = 10ms^-2, find

    (i) the speed Nathan hits the ball

    h = ?
    h0 = 1.25
    g = -10
    v = ?
    u = ?
    t should = 0 I think.

    So what do I do to solve it? Am I meant to solve it simulataineously to find both the variables v and u somehow?

    Please help.


    Draw a diagram - there are three stages to the ball's movement

    1. Going up from 1.25m to its maximum height
    2. Going down from maximum height to 1.25m
    3. Going from 1.25m to 0m (the ground)

    NOTE I have split the ball's journey into these three stages because stage one and two take the same amount of time to happen, as the ball travels the same distance

    Use UVAST separately on each of the three stages (start with stage 3 and work out the time it takes, then subtract this from 2.5 (the total time) and remember that stage 1 and 2 take the same amount of time)
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Updated: October 11, 2009

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