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24 Apr 2009 23:23:32 IST

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The work done by a spring is always_______? 1)Positive 2) Negative 3) May be negative or positive

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The work done by a spring is always_______? 1)Positive 2) Negative 3) May be negative or positive

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NugoRama

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24 Apr 2009 23:25:52 IST

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sorry ..editing it ..

nothig important was here..

krishna gopal singh is rite...

BALGANESH

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24 Apr 2009 23:32:00 IST

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work done by spring is given as = -1/2kx^2

so its negative when the final extension is more than the initial extension

but if initial extensionm is m ore than final extension then its positive

so it may be negative or positive

the answer is c)

Killer Kiran

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24 Apr 2009 23:33:59 IST

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NEGATIVE AS THE FORCE IS OPPOSITE TO THE DISPLACEMENT OF THE SPRING...

Jammalamadaka

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24 Apr 2009 23:40:21 IST

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I would Really like one single answer.....

Krishna Gopal Singh

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24 Apr 2009 23:44:47 IST

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It can be either positive or negative.A mass attached to a stretched spring is released. The mass will be pulled by spring and displacement is along force so work is positive.If a mass moving with some velocity hits an un-stretched spring it will press it and displacement will be against force. In this case work is negative.

Jammalamadaka

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24 Apr 2009 23:54:38 IST

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Thank you, sir.

Vikram Saxena

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25 Apr 2009 00:57:21 IST

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F = - kx [hookes law]

W = - 1 / 2 k x²

read the proof from NCERT or HC VERMA

tejas

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25 Apr 2009 01:06:51 IST

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can b both....in extension--+ve and wen it moves bakwards-- -ve

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