Question

Energia cinetica a unui corp este Ec=9J atunci cind viteza acestuia este v=15m/s.Determinati masa corpului

Answer 1

Ec=$\frac{m* v^{2} }{2}$
9=$\frac{m* 15^{2} }{2} \ \textless \ =\ \textgreater \ 9= \frac{m*225}{2} =\ \textgreater \ 225m=9*2=18=\ \textgreater \ m= \frac{18}{225}= 0,08 kg$

Answer 2

Daca Ec=m*v*v/2

m=2*Ec/v*v =>m=2*9/225
=0.08kg
=80g