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A 0.69 kg block attached to a spring with force constant 133 N/m is free to
move on a frictionless, horizontal surface as in the figure below. The block is
released from rest after the spring is stretched 0.13 m.
X=0
E- mo
(b)
(a) At that instant, find the force on the block.
The response you submitted has the wrong sign. N
(b) At that instant, find its acceleration.
The response you submitted has the wrong sign. m/s?

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