# 7.69 . A 0.500-kg block attached to a spring with length 0.60 m and force constant 40.0 N>m is at rest with the back of the block at point A on a frictionless horizontal air table (Fig. P7.69). The mass of the spring is negligible. You move the block to the right along the surface by pulling with a constant 20.0-N horizontal force. (a) What is the block’s speed when the back of the block reaches point B which is 0.25 m to the right of point A? (b) When the back of the block reaches point B you let go of the block. In the subsequent motion how close does the block get to the wall where the left end of the spring is attached?

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Question source: “University Physics with Modern Physics by Hugh Young and Roger Freedman

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