Q. A man weighs $80\ kg$. He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of $5m/s^{2}$. What would be the reading on the scale. $(g = 10\ m/s^{2})$
A) $400\ N$
B) $800\ N$
C) $1200\ N$
D) Zero
Explanation
(c) For accelerated upward motion
$R = m\ (g + a) = 80\ (10 + 5) = 1200\ N$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.