Q.
An object of mass 5 kg is attached to the hook of a spring balance and the balance is suspended vertically from the roof of a lift. The reading on the spring balance when the lift is going up with an acceleration of $0.25{ms}^{- 2}$ is $(g = 10{ms}^{- 2})$
A) $51.25\ N$
B) 48.75 N
C) 52.75 N
D) 47.25 N
Explanation
(a) On moving upward,
$weight,\ \ w = m(g + a) = 5(10 + 0.25)$
$= 5 \times 10.25 = 51.25\ N$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.