Answers
potentai energy = 0.5*k*dx^2
at 10 cm U1 = 0.5*k*(0.1-a)^2
at 12 cm U2 = 0.5*k*(0.12-a)^2
at 14 cm U3 = 0.5*k*(0.14-a)^2
work done from 10 cm to 12 cm
U2 - U1 = 6
0.5*k*( (0.12-a)^2 - (0.1-a)^2 ) = 6.....(1)
work done fron 12 to 14 cm
U3 - U2 = 10
0.5*k*( (0.14-a)^2 - (0.12-a)^2 ) = 10........(2)
solving 1 & 2
original length = a = 0.08 m = 8 cm <<<---answer
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