A 1.4-kg block is supported as shown by a spring of constant k = 400 N/m which can act in tension or compression. The block is in its equilibrium position when it is struck from below by a hammer which imparts to the block an upward velocity of 2.5 m/s. Determine (a) The time required for the block to move 60 mm upward, (b) The corresponding velocity and acceleration of theblock.
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