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An ideal spring with spring - constant `K` is bung from the colling and `a` block of mass `M` is attached to its lower end the mass is released with the spring initally unstetched . Then the maximum exlemsion in the spring isA. `(4Mg)/(K) `B. `(2Mg)/(K) `C. `(Mg)/(K) `D. `(Mg)/(4K) ` |
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Answer» Correct Answer - B (b) The shown situation can also be looked upon as the decreses is the gaviational potental energy of spring mass system is equal to the gain in spring elastic poential energy `Mgx = (1)/(2) kr^(2) , x = (2Mg)/(k)` |
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