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×g)kg

C) (4×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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