A mass is attached to a horizontal spring and placed on a frictionless surface. It is

pulled away from equilibrium to the right and released, resulting in simple harmonic

motion. When the spring is at its maximum compression, indicate whether each

quantity below is positive, negative, or zero. $($assume right to be the positive

direction$)$

a$)$ velocity

b$)$ acceleration

c$)$ kinetic energy

d$)$ potential energy