a block of mass25kg is raised …

750N and 250N in the respective cases; Method (b) Mass of the block, m= 25kg Mass of the man, M= 50kg Acceleration due to gravity, g= 10m/s² Force applied on the block, F= 25×10=500N Case (a): When the man lifts the block directly In this case, the man applies a force in the upward direction. This increases his apparent weight. Action on the floor by the man =250+500=750N Case (b): When the man lifts the block using a pulley In this case, the man applies a force in the downward direction. This descreases his apparent weight. Action on the floor by the man =500-250=250N If the floor can yield to a normal force of 700N, then the man should adopt the second method to easily lift the block by applying lesser force.

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