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    qmaster's Avatar
    qmaster Posts: 12, Reputation: 1
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    #1

    Aug 3, 2012, 05:50 AM
    test your knowledge
    A body starts from rest and falls vertically through a height of 19.6m . If g=9.8m/s2 then the time taken by the body to fall through the last metre of its fall is? Ans :0.05 sec please solve it..
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Aug 3, 2012, 07:26 AM
    First you need to calculate the time it takes for a body to fall 19.6m Use the fundamental equation



    and solve for t where x(t) = -19.6m, x_0 and v_0 =0, and a=g = -9.8m/s^2.

    Then do the same for x(t) = 18.6m, then take the difference of the two times.
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