Question

A lift is moving in upward direction. The total mass of the lift and the passangers is $1600kg$. The variation of the velocity of the lift is as shown in the figure. The tension in the rope at $t=8s$ will be

• A. 11200 N
• B. 16000 N
• C. 48000 N
• D. 12000 N

Answer 1

Answer: (A)

$t=6s$ to $t=10s$

$a=-\frac{12}{4}=-3m{s}^{-2}$
$T-Mg=Ma$
$T=M(g+a)$
$=1600(10-3)=11200N$