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    purnima1208's Avatar
    purnima1208 Posts: 1, Reputation: 1
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    #1

    Aug 8, 2008, 08:24 AM
    Straight line motion
    A ballon at a height of 80 m is ascending with a velocity of 30 m/ Sec , a body of mass 1 kg is dropped from it . When will the body reach earth surface?
    kesavan's Avatar
    kesavan Posts: 118, Reputation: 1
    Junior Member
    		  
    #2

    Aug 8, 2008, 10:14 AM
    use s=ut+1/2at^2 ( downwards)
    s=+80
    u=-30
    a=10
    ...
    t>0 so u can get t=8sec
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