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Define instantaneous acceleration and re...

Define instantaneous acceleration and represent the same in vector form.

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The instantaneous acceleration is the limiting value of the average acceleration as the time interval approaches to zero.
i.e., `veca=underset(/_\t to0)Lt(/_\vecv)/(/_\t)=(dvecv)/(dt)`
i.e. `veca=hatiunderset(/_\t to0)Lt(/_\v_x)/(/_\t)+hatjunderset(/_\t to0)Lt(/_\v_y)/(/_\t)`
or `veca=hati(dv_x)/(dt)+hatj(dv_y)/(dt)=a_xhati+a_yhatj`
`|veca|=a=sqrt(a_x^2+a_y^2)" "prop=tan^(-1)((a_y)/(a_x))` w.r.t `a_x`
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