m=10 g=0,01 kg
[tex]E=E_c+E_p < = > 0,049=E_c+0,029= > E_c=0,049-0,029= > E_c=0,02J\\E_c=\frac{mv^2}{2} < = > 0,02=\frac{0,01v^2}{2}= > v^2=\frac{2*0,02}{0,01}=2*2=4= > v=\pm\sqrt{4} =\pm2 m/s[/tex]
Fizic are semnificatie doar v=2 m/s
[tex]E_c'=\frac{mv'^2}{2}=\frac{0,01*3,13^2}{2}=\frac{0,01*9,8}{2}=0,029 J\\ E=const=0,029 J= > E=E_c'+E_p' < = > 0,029=0,029+E_p' < = > 0=E_p'[/tex]
