The system shown in figure is released from rest with mass 2 kg in contact with the ground. Pulley and spring are massless, and friction is absent everywhere. The speed of 5 kg block when 2 kg block leaves the contact with the ground is (force constant of the spring 
and 
)
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Let x be the extension in the string when the 2 kg block leaves the contact with ground. Then tension in the spring should be equal to the weight of 
block:
Now from conservation of mechanical energy,
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