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 $
