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:If a wire 30cm long is extended to 30.5cm by a force…A stone tied to a string is made to revolve in a…A body of mass m = 0.5 kg is suspended by a string…An elastic string of force constant 200N m-1 is…An electric string of length l is elastically…