Answer:
When the lift is stationary. The reaction of the spring is equal to weight of the bag. \[\therefore \] \[R=mg=49N\] or \[m=\frac{49}{g}=\frac{49}{9.8}=5kg\] When the lift moves downward. The reaction is \[R'=m(g-a)=5(9.8-5)=\mathbf{24N}.\]
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