A body of mass 1.25kg is attached to a spring of spring constant k=20N/m. if a body has a velocity of 20 m/s when it passes at the equilibrium position calculate the maxiumum extension or compression of a spring? please formula

Suppose a force of 60 n is required to stretch and hold a spring 0.1 m from its equilibrium position. a. assuming the spring obeys hooke's law, find the spring constant k. b. how much work is required to compress the spring 0.5 m from its equilibrium position? c. how much work is required to stretch the spring 0.6 m from its equilibrium position? d. how much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. kequals 600