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Questions  

A spring of force constant 10 N/m has initial stretch 0.2 m. In changing the stretch to 0.25 m, the increase of PE is about :

a
0. 1 joule
b
0.2 joule
c
0.3 joule
d
0.5 joule

detailed solution

Correct option is A

Increase in PE = =12kx22−kx12=12(10)0.252−0.22=0.1125J

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