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

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

AIIMSAIIMS 2016

Solution:

$t = 6 \,s$ to $t = 10\, s$
image
$ a =-\frac{12}{4}=-3 \,m s^{-2} $
$T-M g =M a $
$ T =M(g+a) $
$=1600(10-3)=11200\, N $