Two discs of masses [tex] m_1 [/tex] and [tex] m_2 [/tex], both of radius R, have centers connected by a spring so that they can roll without slipping. At the initial moment the centers are at [tex] x_1(0) = 0, x_2(0) = 2L_0 [/tex] and have initial speeds [tex] -v_0 [/tex] and [tex] 2v_0 [/tex] respectively. Find their positions at all later times. The unstretched spring has length [tex] L_0 [/tex] and a spring constant(adsbygoogle = window.adsbygoogle || []).push({});

[tex] k = \frac{9 v_0^2 m_1 m_2}{2 L_0^2 (m_1 + m_2)} [/tex]

I seem to arrive at an equation which does not need the spring constant. Can you start me off ?

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# Homework Help: Find positions of spring

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