4. Given that the position vector of a particle at time t is given by r = rf, show that the velocity ī:= = rî + rolê and
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4. Given that the position vector of a particle at time t is given by r = rf, show that the velocity ī:= = rî + rolê and acceleration ā := tento = (– rë2) + (rö +2r0)ên, where a dot indicates the first derivative with respect to time and a double dot is the second derivative with respect to time. Use the result of the previous problem.