# Two blocks of masses M and 3M are placed on a horizontal, frictionless surface. A light spring is…

Two blocks of masses M and 3M are placed on a horizontal, frictionless surface. A light spring is attached to one of them, and the blocks are pushed together with the spring between them (Fig. P9.4). 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 systems original elastic potential energy, taking M 0.350 kg. (c) Is the original energy in the spring or in the cord? Explain your answer. (d) Is momentum of the system conserved in the

Two blocks of masses M and 3M are placed on a horizontal, frictionless surface. A light spring is attached to one of them, and the blocks are pushed together with the spring between them (Fig. P9.4). 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 systems original elastic potential energy, taking M 0.350 kg. (c) Is the original energy in the spring or in the cord? Explain your answer. (d) Is momentum of the system conserved in the bursting-apart process? How can it be, with large forces acting? How can it be, with no motion beforehand and plenty of motion afterward?

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