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After doing other parts I found the mass to be 4.561 kg, the total enegy of the system to be 18.79 J, the amplitude to be 1.12 m, and the maximum speed to be 2.86 m/s.

The part that I am stuck on/don't understand is: At what displacement is the speed maximized?

What am I supposed to do? What formulas am I supposed to use?