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    Could anyone tell me where I have gone wrong in this, I have just used the equation of y=Ut+1/2at^2 +h and used it in the upwards direction as positive???


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    (Original post by Jimmy20002012)
    Could anyone tell me where I have gone wrong in this, I have just used the equation of y=Ut+1/2at^2 +h and used it in the upwards direction as positive???


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    Posted from TSR Mobile
    If you've taken the upwards direction as positive, the second line of your working should be:

    0 = -8tsin\alpha - 4.9t^2 + 6
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    (Original post by lizard54142)
    If you've taken the upwards direction as positive, the second line of your working should be:

    0 = -8tsin\alpha - 4.9t^2 + 6
    Could you just quickly explain why??


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    (Original post by Jimmy20002012)
    Could you just quickly explain why??


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    The y component of the velocity is in the downwards direction, which by your definition is negative
 
 
 
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