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A block of mass m kg is kept on a weighi...

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)

A

mg

B

`m(g-a)`

C

`m(1-(1)/(g))`

D

`m(g+a)`

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