A 60-kg person drops from rest a distance of 1.20 m to a platform of negligible mass supported by a stiff spring. The platform drops 6 cm 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