Q. A lift is going up. The total mass of the lift and the passenger is $1500\ kg$ the variation in the speed of the lift is as given in the graph. The tension in the rope pulling the lift at $t = 11^{th}\sec$ will be
A) $17400\ N$
B) $14700\ N$
C) $12000\ N$
D) Zero
Explanation
(c) At 11$^{th}$ second lift is moving upward with acceleration
$a = \frac{0 - 3.6}{2} = - 1.8\ m/s^{2}$
Tension in rope, $T = m(g - a)$
$= 1500(9.8 - 1.8) = 12000\ N$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.