Question

A boy is standing on a weighing machine inside a lift. When the lift goes upwards with acceleration \(\dfrac{g}{5}\), the machine shows the reading \(50\) kg wt. When the lift goes downward with acceleration \(\dfrac{g}{4}\), the reading of the machine, in kg wt, will be

• A. \(50\)
• B. \(30\)
• C. \(45.5\)
• D. \(62.5\)
• E. \(14\)

Hint:

Lift problems use: \[ N=m(g+a) \quad \text{or} \quad N=m(g-a) \] Then divide by \(g\) if the reading is in kg wt.

Answer 1

The Correct Option is C