m = 0.500 kg k = 40.0 N/m F = 20.0 N www 0.60 m 0.25 m· A В
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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. ). 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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