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MHT CET202120 Sep 2021Evening ShiftPhysicsLaws of MotionActual

The weight of a man in a lift moving upwards with an acceleration ' a ' is 620 ~N . When the lift moves downwards with the same acceleration, his weight is found to be 340 ~N . The real weight of the man is

Options

  1. A620 ~N
  2. B680 ~N
  3. C380 ~N
  4. D480 ~N

Correct answer

D. 480 ~N

Step-by-step solution

aligned & m ( g + a )=620 ~N & ~m ( ~g - a )=340 n & g + a g - a = 620 340 & a = 7 24 ~g aligned Hence, from eq.(i) actual weight mg =480 ~N

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