Laws Of Motion Question 426
The system is released from rest. The spring gets elongated
Options:
A) for M > m
B) for M > 2 M☉
C) for $ M>\frac{m}{2} $
D) for any value of M
Show Answer
Answer:
Correct Answer: D
Solution:
Net pulling force on the system is $ Mg + mg $ or Mg.
Total mass being pulled is $ M+2m $. Hence, acceleration of the system is $ a =\frac{Mg}{M+2m} $
Now since a < g. There should be an upwards force on m so that its acceleration becomes less than g.
Hence, for any value of m, the spring will be elongated.
BETA
