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The displacement of a block attached to a horizontal spring whose spring constant is 6 N/m...

The displacement of a block attached to a horizontal spring whose spring constant is 6 N/m is given by

x=1.1cos⁡(3.4t−0.8) m.

The block is of mass (kg)?
The total energy of the system is (J)?
What is the earliest time (t>0) when the kinetic energy equals one-half the potential energy (s)?

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