20 J work is required to stretch a spring through 0.1 m. Find the force constant of the spring If the spring is further stretched through 0.1 m, calculate work done

20 J work is required to stretch a spring through 0.1 m. Find the forc

1.	20 J work is required to stretch a spring through 0.1 m. Find the force constant of the spring If the spring is further stretched through 0.1 m, calculate work done
Answer» Solution :P.E. of spring when stretched through a distance 0.1 m `U=W.D.=1/2K.x^(2)=20J or k=4000N/m` when spring is fruther stretched through 0.1 m, then P.E. will be: `U^(.)=1/2k(0.2)^(2)=80J` `W.D.=U^(.)-U=80-20=60J`