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Q. A 60 kg person drops from rest a distance of 1.20m to a platform of negligible mass supported by a stiff spring. The platform drops 6cm before the person comes to rest. What is the spring constant of the spring?

1. 3.45 × 10^4 N/m
2. 8.83 × 10^4 N/m
3. 2.56 × 10^5 N/m
4. 4.12 × 10^5 N/m
5. 3.92 × 10^5 N/m

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