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A 0.28-kg block on a horizontal frictionless
surface is attached to an ideal massless
spring whose spring constant is 500 N/m.
The block is pulled from its equilibrium
position at x = 0 m to a displacement x =
%3D
+0.080 m and is released from rest. The
block then executes simple harmonic
motion along the horizontal x-axis. When
the displacement is x = -0.052 m, find the
%3D
acceleration of the block. ?109

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