Question Detail
Question
Find the mass of an object attached to the hook of a spiral balance which is vertically attached to the roof of a lift. The reading on the spring balance when the lift goes down with an acceleration of 0.1 m/s² is 29.7N.
Correct Answer
Option B is the correct answer.
Detailed Explanation
When lift accelerates downward, apparent weight = m(g - a). So 29.7 = m(10 - 0.1) = m × 9.9. Therefore m = 29.7/9.9 = 3 kg.
Hint
For downward acceleration, reading = m(g - a).