bagaimana cara mengitung soal nomer 6 fisika

m = 509 gr = ½ kg.g = 9,8 m/s²
∆x = 26,4 - 25 = 1,4 cm = 1,4/100 m
k = __?

F = k ∆x
mg = k ∆x
k = m g / ∆x
k = ½ • 9,8 / (1,4/100)
k = 490 / 1,4
k = 350 N/m ✓