Calculate the work required to stretch the following springs 1.5 m from their equilibrium positions. Assume Hooke's law is obeyed. a. A spring that required 120 J of work to be stretched 0.2 m from its equilibrium position. b. A spring that required a force of 300 N to be stretched 0.5 m from its equilibrium position. How much work is required to move an object from x =1 to x =4 (measured in meters} in the presence 6 of a force (in N) given by F(x) = 2 acting along the x-axis? x