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#WORK AND ENERGY Natural length of a spring is 60cm and its s | Class 9th MCQ - Pre-NTSE Quiz

#WORK AND ENERGY

Natural length of a spring is 60cm and its spring constant is 4000 N/m. A mass of 20 kg is hung from it. The extension produced in the spring is (take,g=9.8m/s²)
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18%
4.9cm
40%
0.49cm
32%
9.4cm
10%
0.94cm