Question

A man weighs 80 kg. He stands on a weighing
scale in a lift which is moving upwards with a
uniform acceleration of 5 m/s2. What would be the
reading on the scale? (g = 10 m/s2)
(1) Zero
(2) 400 N
(3) 800 N
(4) 1200 N

Answer 1

Answer:

weight means gravitational force between object and earth

so weight = mass * net acceleration

   weight = 80 * (10 + 5)

   weight = 1200 N

Explanation: