A person standing on a spring balance inside a stationary lift measures 60 kg. The weight of that person if the lift descends with uniform downward acceleration of $1.8 \mathrm{~m} / \mathrm{s}^2$ will be_N. $\left[\mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2\right]$
