First slide

making equation on system

Question

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 shown in the graph. The tension in the rope of the lift at t = $11^{th}$ second will be ____

Moderate

A

17.4 kN
B

14.7 kN
C

12.3 kN
D

Zero

Solution

Deceleration of the Left at t = 11 sec = $\frac{3 .6}{2} m / s^{2} = 1 .8 m / s^{2}$
$∴ Tension = (1500 \times 10 - 1500 \times 1 .8) N = 12 .3 kN$

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