Energy Conservation with Conservative Forces: a 60

Energy conservation with conservative forces: A 60.0-kg person drops from rest a distance of 1.20 m to a platform of negligible mass supported by an ideal stiff spring of negligible mass. The platform drops 6.00 cm before the person comes to rest. What is the spring constant of the spring?

A) 2.56 × 10⁵ N/m
B) 3.92 × 10⁵ N/m
C) 5.45 × 10⁴ N/m
D) 4.12 × 10⁵ N/m
E) 8.83 × 10⁴ N/m