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29 November, 06:45

A stone is dropped from a tower of height 3600cm. Find the velocity by which it strike the ground. Also, find the time taken to reach the ground.

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  1. 29 November, 07:40
    0
    Here h=36m, a=g=10m/s, u=0

    Use s=ut + (1/2) at^2

    36=0*t + (10t^2) / 2

    time=2.68 sec

    As from the formula of final velovity, v = (2gh) ^1/2

    v = (2*10*36) ^1/2

    v = (720) ^1/2

    v=26.83 ... This is the final velocity
  2. 29 November, 08:26
    0
    s = vit + 1/2 gt*2

    36 = 0 + 1/2 x 9.8 x t*2

    t*2 = 7.34

    t = 2.7sec

    now,

    2gs = vf*2 - vi*2

    2 x 9.8 x 36 = vf*2 - 0

    vf*2 = 705.6

    vf = 26.5m/s
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