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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 m/s2, the tension in the supporting cable is

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a

9680 N

b

11000 N

c

1200 N

d

8600 N

answer is B.

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Detailed Solution

Total mass = Mass of lift + Mass of person                   =940+ 60= 1000kg                   T- mg= maHence, Z- 1000 x l0 =1000 x IT = 11000N
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