A horizontal spring with force constant k = 685 N/m is attached to a wall at one end and to a block of mass m = 2.35 kg

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A horizontal spring with force constant
k = 685 N/m
is attached to a wall at one end and to a block ofmass
m = 2.35 kg
at the other end that rests on a horizontal surface. Theblock is released from rest from aposition 4.30 cm beyond the spring's equilibriumposition.
(a) If the surface is frictionless, what is the speed of theblock as it passes through the equilibrium position? m/s (b) If the surface is rough and the coefficient of kinetic frictionbetween the box and the surface is
𝜇k = 0.250,
what is the speed of the block as it passes through theequilibrium position? m/s