The potential energy in an elastic string of force constant K which has been extended by X metres is expressed as by Sunday | May 20 | Physics WAEC | 0 comments A. ½kX² B. kX² C. ½kX D. kX Correct Answer: Option A A. ½kX² Users Also Read These:A body of mass m = 0.5 kg is suspended by a string…An elastic string of force constant 200N m-1 is…If a wire 30cm long is extended to 30.5cm by a force…The energy stored in the spring of stiffness…The mass attached to a string is moving in a…