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m1=3kg
V1=2m/s
V2=6m/s
m2 = ?
ROZWIĄZANIE:
Ek= 1/2* m * V^2
Ek1=Ek2
Ek1= 1/2*3 *2^2 = 6 [J]
Ek2= 1/2 *m2 *6^2 = Ek1 = 6
1/2*36 * m2 = 6
18*m2 = 6 |/18
m2 = 6/18 = 1/3 [kg]
ODPOWIEDŹ: Ciało 2. waży 1/3 kilograma.