A block with mass m $=3\mathrm{.}7$kg on a horizontal frictionless surface is attached to a spring whose forceconstant is k $=450$ Nm$.$ The block is pulled from its equilibrium position at xeq $=0$m to a displacement ofxi $=0\mathrm{.}080$m and is released from rest. The block then executes simple harmonic motion.a$)$ What is the maximum potential energy stored in the block$-$spring system? $[5$pt$.]$b$)$ What is the maximum velocity of the block?