sparkly16
A spring with a force constant 400 N/m hangs vertically. You attach a 2.2 kg block to it and allow the mass to fall. What is the max distance the block will fall before it begins moving upward?
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rajathsbhat
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The concept: the change in potential energy of the block is EXACTLY equal to the elastic potential energy of the spring. Does that help?
sparkly16
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ya a little
sparkly16
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i'll get 21.5x = 405x^2 know what?
rajathsbhat
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elastic potential energy is give by 1/2 kx^2. So how can you get 405x^2 ?
rajathsbhat
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*given
sparkly16
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* 200 x^2
rajathsbhat
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there you go. So now, all you have to do is... simplify.
sparkly16
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that's the part i have trouble with
rajathsbhat
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Just cancel 1 'x' on both sides.
sparkly16
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oh ya
sparkly16
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so it would be 11 cm?
rajathsbhat
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yep. 10.75 cm.
sparkly16
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ok thanks a lot
rajathsbhat
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:)