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Block A is hanging from a vertical spring and is at rest. Block B strikes the block A with velocity v and sticks to it. Then the value of v for which the spring just attains natural length is :
- a)
- b)
- c)
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
BlockAis hanging from a vertical spring and is at rest. BlockBstrikes ...
The initial extension in spring is 
Just after collision of B with A the speed of combined mass is v/2.
Just after collision of B with A the speed of combined mass is v/2.
For the spring to just attain natural length the combined mass must rise up by 
(see fig.) and comes to rest.
(see fig.) and comes to rest.
Applying conservation of energy between initial and final states.
Alternate solution by SHM
Most Upvoted Answer
BlockAis hanging from a vertical spring and is at rest. BlockBstrikes ...
The initial extension in spring is 
Just after collision of B with A the speed of combined mass is v/2.
Just after collision of B with A the speed of combined mass is v/2.
For the spring to just attain natural length the combined mass must rise up by 
(see fig.) and comes to rest.
(see fig.) and comes to rest.
Applying conservation of energy between initial and final states.
Alternate solution by SHM
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BlockAis hanging from a vertical spring and is at rest. BlockBstrikes the blockAwith velocityvand sticks to it. Then the value ofvfor which the spring just attains natural length is :a)b)c)d)None of theseCorrect answer is option 'B'. Can you explain this answer?
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BlockAis hanging from a vertical spring and is at rest. BlockBstrikes the blockAwith velocityvand sticks to it. Then the value ofvfor which the spring just attains natural length is :a)b)c)d)None of theseCorrect answer is option 'B'. Can you explain this answer? for Physics 2025 is part of Physics preparation. The Question and answers have been prepared according to the Physics exam syllabus. Information about BlockAis hanging from a vertical spring and is at rest. BlockBstrikes the blockAwith velocityvand sticks to it. Then the value ofvfor which the spring just attains natural length is :a)b)c)d)None of theseCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Physics 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for BlockAis hanging from a vertical spring and is at rest. BlockBstrikes the blockAwith velocityvand sticks to it. Then the value ofvfor which the spring just attains natural length is :a)b)c)d)None of theseCorrect answer is option 'B'. Can you explain this answer?.
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