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Laws of Motion
Question
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A person of mass 62 kg is inside of 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

  • 9680 N

  • 11000 N

  • 1200 N 

  • 8600 N

Answer

B.

11000 N


Total mass = Mass of lift + Mass of person
= 940 +60 = 1000 kg
T - mg = ma
Hence, T - 1000 x 10 = 1000 x 1
 T = 11000 N

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