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Q.

A person of mass 60 kg is inside a lift of mass 940 kg and presses the button on control panel. The lift starts moving upwards with an acceleration 1.0 m/s2 If g = 10 ms-2 the tension in the supporting cable is

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a

8600 N

b

11000 N

c

9680 N

d

1200 N

answer is C.

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Detailed Solution

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Total mass = (60 + 940) kg = 1000 kg
Let T be the tension in the supporting cable, then
T – 1000g = 1000 × 1
⇒ T = 1000  ×11 = 11000 N

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A person of mass 60 kg is inside a lift of mass 940 kg and presses the button on control panel. The lift starts moving upwards with an acceleration 1.0 m/s2 If g = 10 ms-2 the tension in the supporting cable is