The density of water with a temperature of $20$ was measured as $0\mathrm{.}9982$ g$/$cm$3.$ Density of $3,151$g$/$cm$\text{'}$

A sphere of radius $9\mathrm{.}23\mathrm{.}10-4$ em made of metal falls from a height of $50$ cm in water at $1254$ s$.$

Calculate the viscosity of water at $20\backslash$deg C$.$