The work to required to strech a certain spring by an elongation of 4.00 cm to an elongation of 5.00cm is 30.5 J. (a)is the work required to increase the elongation of the spring from 5.00 cm to 6.00 cm greater than,less than or equal to30.5J? Explain (b) verify your answer to part (a) by calculating the required work.