Laws of Motion - Result Question 31

31. A man weighing 80kg, stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of 5m/s2. What would be the reading on the scale? (g=10m/s2) [2003]

(a) 1200N

(b) zero

(c) 400N

(d) 800N

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Answer:

Correct Answer: 31. (a)

Solution:

  1. (a) Reading of the scale = Apparent wt. of the man =m(g+a) =80(10+5)=1200N


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