A spring has a natural length of 25 cm and a force of 3.5 N is required to stretch and hold the spring to a length of 32 cm. What is the work required to stretch the spring from a length of 30 cm to a length of 45 cm?
A. 11/16 J
B. 13/16 J
C. 15/16 J
D. 17/16 J
