Two blocks of masses m and 3m are placed on a frictionless, horizontal surface. A
light spring is attached to the more massive block, and the blocks are pushed together
with the spring between them (Fig. P9.5). A cord initially holding the blocks together
is burned; after that happens, the block of mass 3m moves to the right with a speed of
2.00 m/s. (a) What is the velocity of the block of mass m? (b) Find the system’s original
elastic potential energy, taking m = 0.350 kg. (c) Is the original energy in the spring or
in the cord? (d) Explain your answer to part (c). (e) Is the momentum of the system
conserved in the bursting-apart process? Explain how that is possible considering (f)
there are large forces acting and (g) there is no motion before-hand and plenty of
motion afterward?
Figure P9.5
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