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Posted by on Thursday, September 6, 2012 at 12:11am.

a particle falling under gravity falls 39m in certain second find time required to cover the next 30 m take g=9.8

  • engineering - , Friday, September 7, 2012 at 7:13pm

    V^2 = Vo^2 + 2g*d.
    V^2 = 0 + 19.6*39 = 764.4
    V = 27.65 m/s.

    d = Vo*t + 0.5g*t^2 = 30 m.
    27.65t + 4.9t^2 = 30
    4.9t^2 + 27.65t - 30 = 0
    Use Quadratic Formula and get:
    Tf = 0.931 s. = Fall time.

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