1. v= delta d/ delta t
v= 200km/1h10min
v=200000m/4200s
v=47,61 m/s
2.V=m/ro
V=2000g/7.8g/cm^3
V=256,41 cm^3 = 0,00025641 m^3
3. delta l = l1 - l2
delta l = 7-2 =5 cm =0.05 m
F= delta l x k
F= 0.05 m x 200N/m = 10 N
Sper ca aceste calcule sunt corecte