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NEET2009PhysicsLaws of MotionActual

The mass of a lift is 2000 ~kg . When the tension in the supporting cable is 28000 ~N , then its acceleration is

Options

  1. A30 ~ms ⁻² downwards
  2. B4 ~ms ⁻² upwards
  3. C4 ~ms ⁻² downwards
  4. D14 ~ms ⁻² upwards

Correct answer

B. 4 ~ms ⁻² upwards

Step-by-step solution

Key Idea Apparent weight > actual weight, then the lift is accelerating upward. Here, lift is accelerating upward at the rate of a Hence, equation of motion is written as gathered R - mg = ma 28000-20000=2000 a a = 8000 2000 =4 ~ms ⁻² upwards gathered

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