Laws Of Motion Question 309
Question: A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads 49 N, when the lift is stationary. If the lift moves downward with an acceleration of $ 5m/s^{2} $ , the reading of the spring balance will be
Options:
A) 24N
B) 74N
C) 15N
D) 49N
Show Answer
Answer:
Correct Answer: A
Solution:
[a] For the bag accelerating down $ mg-T=ma $
$ \therefore T=m(g-a) $
$ =\frac{49}{10}( 10-5 ) $
$ =24.5 $
