Explicație:
m = 2 dag = 0.02 kg
[tex]F = ma\\F = bt\\ma = bt => a = \frac{b}{m}t[/tex]
[tex]v(t) = at[/tex]
[tex]v(t) = \frac{b}{m} *t^{2}[/tex]
t = 2s
b = 0.6 N/s
m = 0.02 kg
[tex]v(2) = 120 m/s[/tex]
[tex]Ec = \frac{1}{2} *mv^{2} \\Ec = 144 J[/tex]
