F = k·Δl = 500N/m·0,0098m = 5 x 0,98 = 4,9 N
m = F/g = 4,9N : 9,8N/kg = 0,5kg masa a 20 alune.
0,5kg : 20 = 0,025kg = 25g.
Daca se pun pe cantar 46 alune, acestea vor avea masa m= 0,025kg × 46 =1,15 kg care vor avea
G = mg = 1,15kg × 9,8N/kg =11,27N
F = k·Δl; Δl = F/k =11,27N : 500N/m =0,02254m =22,54 mm.