A) \[30\,m{{s}^{-2}}\]downwards
B) \[4\,m{{s}^{-2}}\] upwards
C) \[4\,m{{s}^{-2}}\]downwards
D) \[14\,m{{s}^{-2}}\]upwards
Correct Answer: B
Solution :
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 \[R-mg=ma\] \[28000-20000=2000a\] \[\Rightarrow \]\[a=\frac{8000}{2000}=4\,m{{s}^{-2}}\]upwards
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