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Laws of Motion question

2011 · Q149
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Laws of Motion question

2011 · Q149

NEETPhysicsLaws of MotionMCQ+4 / −1
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
  1. A
    8600 N
  2. B
    9680 N
  3. C
    11000 N
  4. D
    1200 N
View written solutionFree

Correct answer: C

Here, Mass of a person, m = 60 kg Mass of lift, M = 940 kg,

a = 1 m/s2, g = 10 m/s2

Let T be the tension in the supporting cable.

∴\therefore∴ T – (M + m)g = (M + m)a

⇒\Rightarrow⇒ T = (M + m)(a + g)= (940 + 60)(1 + 10) = 11000 N

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