A force of 7 pounds compresses a 25-inch spring 5 inches. How much work is done in compressing the spring from a length of 17 inches to a length of 13 inches? You will need to divide your answer by 12 to convert from in-lb to ft-lb. O a) 61 ft lb O b) 66 ft lb c) 56 ft lb O d) 51 ft lb O e) 58 ft lb