Suppose that 3 J of work is needed to stretch a spring from its natural length of 24 cm to a length of 33 cm.

(a) How much work (in J) is needed to stretch the spring from 26 cm to 31 cm? (Round your answer to two decimal places.)

(b) How far beyond its natural length (in cm) will a force of 10 N keep the spring stretched? (Round your answer one decimal place.)