Problem 13.11 A force of 10 lb is applied to the cord. Block A weighs 21 lb. Neglect the mass of the pulleys and cords. (Figure 1) Figure 1 ▼of 1 Part A Determine the time needed to pull the cord at B down 6 ft starting from rest. Express your answer to three significant figures and include the appropriate units. t= 0.6418 Submit με S My Answers Give Up ? Incorrect; Try Again; 2 attempts remaining B 10 lb A Provide Feedback