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    A paricle P is projected vertically upwards from a point A with speed 21ms^-1. the point A is 17.5m above horizontal ground. the particale P moves freely under gravity until it reaches the ground with a speed of 28ms^-1. After time t seconds after projection, P is 19m above A Find the possible values of t.
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    (Original post by thefatone)
    A paricle P is projected vertically upwards from a point A with speed 21ms^-1. the point A is 17.5m above horizontal ground. the particale P moves freely under gravity until it reaches the ground with a speed of 28ms^-1. After time t seconds after projection, P is 19m above A Find the possible values of t.
    http://www.thestudentroom.co.uk/forumdisplay.php?f=38
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    did i not post this in the maths section?
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    (Original post by thefatone)
    did i not post this in the maths section?
    you will get better response in Maths I think
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    (Original post by TeeEm)
    you will get better response in Maths I think
    oh okay
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    (Original post by thefatone)
    A paricle P is projected vertically upwards from a point A with speed 21ms^-1. the point A is 17.5m above horizontal ground. the particale P moves freely under gravity until it reaches the ground with a speed of 28ms^-1. After time t seconds after projection, P is 19m above A Find the possible values of t.
    How far have you got?

    Draw a sketch of the motion and choose a direction to be +ve [either up or down].

    Then write down the vlues you know:

    u =
    v =
    a =

    etc.

    Post your working so far please.
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    (Original post by Muttley79)
    How far have you got?

    Draw a sketch of the motion and choose a direction to be +ve [either up or down].

    Then write down the vlues you know:

    u =
    v =
    a =

    etc.

    Post your working so far please.
    oops i forgot to use a -.- well then looks like i screwed up
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    Vertical displacement, s, will be 19
    U is 21ms^-1
    a=-g (since we're taking upwards as positive)
    t=T
    Form quadratic in T and solve.
 
 
 
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