Laws Of Motion Question 175

Question: In the above problem if the lift moves up with an acceleration equal to the acceleration due to gravity, the reading on the spring balance will be[NCERT 1977]

Options:

A) 2 kg

B) $ (2\times g)kg $

C) $ (4\times g)kg $

D) 4 kg

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Answer:

Correct Answer: D

Solution:

When lift moves upward then reading of the spring balance, $ R=m(g+a)=2(g+g)=4g\ N=4\ kg $ [As $ a=g $ ]



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