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Particles 1 and 2 with mass m and 3m, respectively are fixed to the ends of...

Particles 1 and 2 with mass m and 3m, respectively are fixed to the ends of a rigid massless rod of length L1+L2. L1=20 cm and L2=70 cm. The rod is held horizontally on the fulcrum and then released. What are the magnitudes of the initial (a) rotational accelerations for particle 1 and (b) linear accelerations for particle 2?

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