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**help with oscillation problem!!! thanks**

i have no idea how to do this. could someone please explain how to do this. thank you, really appreciate it

A mass of 311 g connected to a light spring

of force constant 37.2 N/m oscillates on a

horizontal, frictionless track. The amplitude

of the motion is 7.6 cm.

1. Calculate the total energy of the system.

Answer in units of J

2. What is the maximum speed of the mass?

Answer in units of m/s

3. What is the magnitude of the velocity of

the mass when the displacement is equal to

1.74 cm?

Answer in units of m/s