11. Two blocks of masses m andЗттw 3m are placed on a friction-less, horizontal surface. Alight spring is attached to themore massive block, and theblocks are pushed togetherwith the spring betweenthem (Fig. P9.11). A cordinitially holding the blockstogether is burned; after thathappens, the block of mass3m moves to the right with aspeed of 2.00 m/s. (a) Whatis the velocity of the block ofmass m? (b) Find the system's original elastic potentialenergy, taking m= 0.350 kg. (c) Is the original energyin the spring or in the cord? (d) Explain your answerto part (c). (e) Is the momentum of the system con-served in the bursting-apart process? Explain how thatis possible considering (f) there are large forces actingand (g) there is no motion beforehand and plenty ofBefore2.00 m/sЗтWWWтAfterFigure P9.11motion afterward?

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