Answer:
Wieght = mass × Gravity
750 = M × 10. { M = mass , taking g = 10m/s² }
M = 75kg
now when elevator is moving down = Relative gravity = actual gravity - down acceleration = 10 - 6 = 4m/s²
So relative mass = Actual mass × relative gravity
75 × 4 = 300N
Note : If the elevator was moving upwards then Relative gravity = actual gravity + acceleration up
