Q. If a body of mass $m$ is carried by a lift moving with an upward acceleration $a$, then the forces acting on the body are (i) the reaction $R$ on the floor of the lift upwards (ii) the weight $mg$ of the body acting vertically downwards. The equation of motion will be given by
A) $R = mg - ma$
B) $R = mg + ma$
C) $R = ma - mg$
D) $R = mg \times ma$
Explanation
The correct answer is Option B: $R = mg + ma$.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.