Find how high does the putty-block system rise

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A .430 kg block of wood hangs from the ceiling by a string, and a 7.10 x 10^-2 kg wad of putty is thrown straight upward, striking the bottom of the block with a speed of 5.80 m/s. The wad of putty sticks to the block.

Is the mechanical energy of this system conserved?

How high does the putty-block system rise above the original position of the block?

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