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March 27, 2017

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The displacement (cm) of a point is given by s= 〖4t〗^3-3√(1+2t) . Find the instantaneous velocity and acceleration at t = 1.5 sec.
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  • calculus - ,

    s = (4t)^3 - 3√(1+2t)
    ds/dt = 3(4t)^2 * 4 - 3/√(1+2t)
    = 12(4t)^2 - 3/√(1+2t)

    d2s/dt2 = 12*2(4t)*4 + 3/√(1+2t)^3
    = 96(4t) + 3/√(1+2t)^3

    Now just plug in t = 3/2 and evaluate

    s(3/2) = 6^3 - 3√4 = 216-6 = 210
    s'(3/2) = 12(6^2) - 3/√4 = 432-3/2 = 430.5
    s''(3/2) = 96(6) + 3/√4^3 = 576+3/8 = 576.375

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