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An electric lift is moving downwards with a acceleration of $\frac{g}{3}$ . The vertical force between a passenger in the lift and its floor equal to                    

         (a) $\frac{2}{3}$ of the passenger’s weight

         (b)$\frac{3}{4}$  of the passenger’s weight

         (c) passenger’s weight

         (d) $\frac{4}{3}$ of the passenger’s weight

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