Question

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 1

3) 900 N 

N = m (g + a )

= 75 x 12 = 900 N