A block of mass \( m \mathrm{~kg} \) is kept on a weighing machine ...

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A block of mass \( m \mathrm{~kg} \) is kept on a weighing machine
P in an elevator. If the elevator is retarding upward by

W \( a \mathrm{~ms}^{-2} \), the reading of weighing machine is (in \( \mathrm{kgf} \) )
(1) \( m g \)
(2) \( m(g-a) \)
(3) \( m\left(1-\frac{a}{g}\right) \)
(4) \( m(g+a) \)
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