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Math Help - Non-dimensional differential equation

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    Non-dimensional differential equation

    Consider non-dimensional equation for the height at the highest point is given by
    \begin{equation} h(\mu)= \frac{1}{\mu}- \frac{1}{\mu^2} \log_e(1+\mu) \end{equation}
    $0<\mu\ll 1.$
    Determine to $O(\mu)$, the (non-dimensional) time for the body to travel from the highest point to the ground, and determine an estimate for the (non-dimensional) speed of the body when it returns to the ground, again to $O(\mu)$.

    => I really don't how to start this question. please help me.
    Last edited by grandy; April 22nd 2014 at 06:45 AM.
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