3. [-/1 Points] DETAILS SCALCET9 6.4.003. A variable force of 4x 2 pounds moves an object along a straight line when it is x feet from the origin. Calculate the work done (in ft-lb) in moving the object from x = 1 ft to x = 14 ft. (Round your answer to two decimal places.) ft-lb Need Help? Read It Watch It 4. [-/1 Points] DETAILS SCALCET9 6.4.009. Suppose that 4 J of work is needed to stretch a spring from its natural length of 32 cm to a length of 49 cm. (a) How much work (in J) is needed to stretch the spring from 36 cm to 41 cm? (Round your answer to two decimal places.) (b) How far beyond its natural length (in cm) will a force of 20 N keep the spring stretched? (Round your answer one decimal place.) cm Need Help? Read It Watch It 5. [-/1 Points] DETAILS SCALCET9 6.4.011. A spring has natural length 27 cm. Compare the work (in J) W, done in stretching the spring from 27 cm to 37 cm with the work (in J) W, done in stretching it from 37 cm to 47 cm. (Use k for the spring constant.) = W , How are W, and W related? W 2 = C 7 w 1 Need Help? Read It Watch It