1.

A man of mass 75 kg stands in a lift. The force exerted on him by the floor when the lift starts moving upward, with an acceleration of 2m/sec2 is 1) 450 N 2) 1000 N 3) 900 N 4) 600 N

Answer»

3) 900 N 

N = m (g + a )

= 75 x 12 = 900 N



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