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You attach a 1.90 kg mass to a horizontal spring that is fixed at one end....

You attach a 1.90 kg mass to a horizontal spring that is fixed at one end. You pull the mass until the spring is stretched by 0.400 m and release it from rest. Assume the mass slides on a horizontal surface with negligible friction. The mass reaches a speed of zero again 0.400 s after release (for the first time after release). What is the maximum speed of the mass (in m/s)?

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