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Periodic Motion :: Discussion
| 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 |
|
| Tutorial Link: |
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