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4. | Natural length of spring is 60 cm and its spring constant is 4000 N/m. A mass of 20 kg is hung from it. The extension produced in the spring (take g=9.8m/s2) is? | |
A. | 4.9cm | |
B. | 0.49cm | |
C. | 9.4cm | |
D. | 0.94cm | |
Answer: Option A | |
Explanation: | |
In equilibrium, kx=mg |
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