A glider of mass 0.13 kg moves on a horizontal frictionless air track. It is permanently attached to one end of a massless horiztonal spring, which has a force constant of 9.1 N/m for both extension and compression. The other end of the spring is fixed. The glider is moved to compress the spring by 0.14 m and then released from rest. Calculate the speed of the glider at the point where it has moved 0.25 m from its starting point.(adsbygoogle = window.adsbygoogle || []).push({});

W=1/2kx^2

W=1/2(9.1)(0.11)^2

=0.055 J

Is this the right way to solve for W before solving for the speed? I wasn't sure if I needed to subtract .25-.14 or not. So far I've been getting the wrong answer and want to know where I'm going wrong.

The equation I use to find speed is W=1/2mvf^2-1/2mvi^2

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# Homework Help: Compressed spring

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