A man weighs 80 kg. He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of 6 m/s ^2 . What would be his weight in kg? ( g = 10 m/s ^2 )

Step-by-step solution

Mass of the man, m = 80 kg Acceleration of the lift, a = 6 m/s ^2 upwards The weighing scale measures the normal reaction N . The equation of motion for the man is: N - mg = ma N = m(g + a) Substituting the given values: N = 80(10 + 6) = 1280 N The reading of the weighing scale in kg is: N g = 1280 10 = 128 kg Answer: 128 kg