A 0.425 kg block attached to a light spring oscillates on a frictionless, horizontal table. The oscillation amplitude is

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A 0.425 kg block attached to a light spring oscillates
on a frictionless, horizontal table. The oscillation amplitude
is A = 0.160 m and the
block moves at 3.25 m/s as it passes through
equilibrium at x = 0.
(a) Find the spring constant, k (in N/m).
Answer in N/m
(b)Calculate the total energy (in J) of the block-spring
system.
Answer in J
(c) Find the block's speed (in m/s)
when x = A/2.
Answer in m/s