A block of mass m = 2.00 kg is attached to a spring of force constant k = 575 N/m as shown in the figure below. The block is pulled to a position x, = 4.90 cm to the right of equilibrium and released from rest. m *=0 x=X; (a) Find the speed the block has as it passes through equilibrium if the horizontal surface is frictionless. X How much energy is stored in the spring when it is at equilibrium? m/s (b) Find the speed the block has as it passes through equilibrium (for the first time) if the coefficient of friction between block and surface is My = 0.350. X Enter a number. fiction causes an increase in the internal energy of the system and a decrease in the total mechanical energy. m/s