An unstrained horizontal spring has a length of 0.30 m and a
spring constant of 240 N/m. Two small charged objects are
attached to this spring, one at each end. The charges on the
objects have equal magnitudes. Because of these charges, the
spring stretches by 0.031 m relative to its unstrained length.
Determine (a) the possible algebraic signs and (b) the magnitude
of the charges.