Q. In the above question, if the lift is moving upwards with a uniform velocity, then the frictional resistance offered by the body is
A) $Mg$
B) $\mu Mg$
C) $2\mu Mg$
D) Zero
Explanation
(b) When the lift is moving upward with constant velocity then,
$R = mg\ \therefore F = \mu\ R = \ \mu\ mg$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.