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Shown is the graph of a force function (in newtons} that increases to its maximum value and then remains constant. F (NJ 245 81D121415 _ {D How much work W is done (in J]: by the force in moving an object a distance of 16 m? WE] If the work required to stretch a spring 1 ft beyond its natural length is 9 ft-Ib, how much work [in ft-lb] is needed to stretch it 6 in. beyond its natural length? A chain lying on the ground is 10 m long and its mass is 60 kg. How much work [in J] is required to raise one end of the chain to a height of4 m? (Use 9.8 mfs2 for g.) :1