Q. A rope ladder with a length $l$ carrying a man with a mass $m$ at its end is attached to the basket of balloon with a mass $M$. The entire system is in equilibrium in the air. As the man climbs up the ladder into the balloon, the balloon descends b y a height $h$. Then the potential energy of the man
A) Increase by $mg(l - h)$
B) Increase by $mgl$
C) Increases by $mgh$
D) Increases by $mg(2l - h)$
Explanation
(a) Effective height through which man moves up
$= 1 - h$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.