Laws Of Motion Question 231

Question: A boy whose mass is 50kg stands on a spring balance inside a lift. The lift starts to ascent with an acceleration of $ 2m{{s}^{-2}}. $ The reading of the machine or balance $ (g=10m{{s}^{-2}}) $ is [Kerala PET 2002]

Options:

A) $ 50kg $

B) Zero

C) $ 49kg $

D) $ 60kg $

Show Answer

Answer:

Correct Answer: D

Solution:

$ R=m(g+a)=50\times (10+2)=600N=60kgwt $



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