A) for M > m
B) for M > 2 m
C) for \[M>\frac{m}{2}\]
D) for any value of M
Correct Answer: D
Solution :
[d] Net pulling force on the system is \[Mg+mgmg\] or Mg. Total mass being pulled is\[M+2m.\] Hence, acceleration of the system is \[\sigma =\frac{Mg}{M+2m}\]
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 spring will be elongated.
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