Laws Of Motion Question 173

Question: A body of mass 2 kg is hung on a spring balance mounted vertically in a lift. If the lift descends with an acceleration equal to the acceleration due to gravity ?g?, the reading on the spring balance will be[NCERT 1977]

Options:

A) 2 kg

B) $ (4\times g)kg $

C) $ (2\times g)kg $

D) Zero

Show Answer

Answer:

Correct Answer: D

Solution:

Reading on the spring balance = m (g a) and since a = g\ Force = 0



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