A man is performing a press up$.$ The vertical ground reaction at his feet is $382$N$($upwards$)$ and the vertical ground reaction at his hands is $439$N$($upwards$).$ The distance between his hands and his feet is $1\mathrm{.}6$m$.$ Assuming static equilibrium and g$=-9\mathrm{.}81.$ Find the mass of the man and the distance of his centre of mass away from his feet.