Question

A block of mass m kg is kept on a weighing machine in an elevator. If the elevator is retarding upward by a ms^-2 ,the reading of weighing machine is (in kgf)

(1) mg
(2) m(g- a)
(3)m(1-a/g)
(4) m(g + a)
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Answer 1

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Answer 2

Answer:

4) m(g+a)

Explanation:

In the elevator weighing machine always measure Normal reaction

Checkout the attachment hope u will understand it