A man weighs 80 kg. He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of 5 ms-2 What would be the reading on the scale? (g = 10 ms-2)

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 ms-2 What would be the reading on the scale? (g = 10 ms-2) (A) 800 N (B) 1200 N (C) Zero (D) 400 N

Tardigrade Admin · Accepted Answer

When the lift is accelerating upwards with acceleration a, then reading on the scale R=m(g+a)=80(10+5) N =1200 N.

Q. A man weighs $80 k g$ . He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of $5 m s^{- 2}$ What would be the reading on the scale? ( $g = 10 m s^{- 2})$

800 N

1200 N

Zero

400 N

When the lift is accelerating upwards with acceleration $a$ , then reading on the scale
$R = m (g + a) = 80 (10 + 5) N = 1200 N$ .

Q. A man weighs 80kg. He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of 5ms−2 What would be the reading on the scale? (g=10ms−2)