Question

A block of mass m = 0.79 kg is attached to a spring with force constant 123.0 N/m. The block is free to move on a frictionless, horizontal surface as shown in the figure. The block is released from rest after the spring is stretched a distance A = 0.10 m to the right. What is the potential energy of the spring/block system 0.25 s after releasing the block?

Answer #1

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A block of mass m = 0.53 kg attached to a spring with force
constant 119 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 a distance A = 0.13 m. (Indicate the
direction with the sign of your answer. Assume that the positive
direction is to the right.)
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Is this right

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