Laws Of Motion Question 237

Question: A man weighs 80kg. He 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) [CBSE PMT 2003]

Options:

A) 400 N

B) 800 N

C) 1200 N

D) Zero

Show Answer

Answer:

Correct Answer: C

Solution:

For accelerated upward motion R=m(g+a)=80(10+5)=1200N



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