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    Hi
    Im so stuck on this question and my brain aches from all the attempts ive had
    i'd be so thrilled if anyone could work it out

    1) a particle is projected vertically upwards from a point A with speed 28ms^-1. The particle takes 20/7 seconds to reach its greatest height above A.
    find the total time for which the particle is more than 17.5m above A.
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    Can you think of a quadratic SUVAT equation which may help you here.
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    Thanks. =)
    I think all this mechanics ive been doing has had an affect on my common sence =/
 
 
 
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Updated: April 15, 2011

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