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`        Block A is hanging from a vertical spring and is at rest. Block B strikes block A with velocity v and sticks to it. Then the value of v for which the spring just attains natural length is`
3 years ago

Vikas TU
10490 Points
```							assuming masses same,0.5mv^2 = 0.5(m+m)v’^2 + 0.5kx^2...............(1)andto gain nautral length again,mgx = 0.5(m+m)v’^2..................(2)solving both eqns. we get,v = sq.root(6mg²/k) m/s
```
3 years ago
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### Course Features

• 110 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions