Question

55. A block of mass m kg is kept on a weighing machine in an elevator. If the elevator is retarding upward by am/s2
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

Answer :-

The reading of weighting machine is = m ( g+a)