Questions

A person of mass 60 kg stands on a weighing machine in a lift which is moving
(a) upwards with a uniform retardation of $2.8 m s^{- 2}$

(b) downwards with a uniform retardation of $2.2 m s^{- 2}$ . Find the reading shown by the weighing machine in each case.

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420 N; 720 N

320 N ; 520 N

720 N ; 420 N

640 N ; 720 N

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detailed solution

Correct option is A

R=m(g−a)=60(9.8−2.8) =60×7=420N R=m(g+a)=60(9.8+2.2) =60×12=720N

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A person of mass 60 kg stands on a weighing machine in a lift which is moving (a) upwards with a uniform retardation of 2.8ms−2 (b) downwards with a uniform retardation of2.2ms−2 . Find the reading shown by the weighing machine in each case.

Remember concepts with our Masterclasses.

Ready to Test Your Skills?

free study material

A person of mass 60 kg stands on a weighing machine in a lift which is moving
(a) upwards with a uniform retardation of $2.8 m s^{- 2}$

(b) downwards with a uniform retardation of $2.2 m s^{- 2}$ . Find the reading shown by the weighing machine in each case.