Total energy of 1.3 kg mass oscillating on a 410 N/m spring

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chaotixmonjuish
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A 1.3 kg object oscillates with simple harmonic motion on a spring of force constant 410.0 N/m. The maximum speed is 0.7 m/s. What is the total energy of the object and the spring?

Do I just set it up like this:

1/2*410*x^2=1/2*1.3*.7^2 to get the max x
Then do I just add them up
 

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No. Both are equal to the total energy. Use just one of them.

Easier would be to write E_tot = (1/2)m(v_max)^2, since m and v_max is given.