Physics - NLM Question with Solution | TestHub

Key Idea Apparent weight $>$ actual weight, then the lift is accelerating upward. Here, lift is accelerating upward at the rate of $a$ Hence, equation of motion is written as $$\begin{array}{c}\mathrm{R}-\mathrm{mg}=\mathrm{ma}\\ 28000-20000=2000\mathrm{a}\\ \Rightarrow \mathrm{a}=\frac{8000}{2000}=4{\mathrm{ms}}^{-2}\text{ upwards }\end{array}$$