Question

Un automobil are viteza initiala de 5m/s si accelereaza cu o acceleratie initiala de 10m/s2, care variaza uniform pana la momentul final de t=2 minute si ajunge la 30m/s2. Calculeaza distanta parcursa de automobil. Randamentul este de 100%.

Answer 1

[tex]Se~da:\\ \\ v_0=5\frac ms\\ \\ a_1=10\frac m{s^2}\\ \\ t=2min=120s\\ \\ a_2=30\frac m{s^2}\\ \\ d=?m\\ \\ \\ Formule:\\ \\ d=v_0\times t+\frac {a\times t^2}2\\ \\ \\ a=\frac {a_1+a_2}2\\ \\ \\ Calcule:\\ \\ a=\frac{10+30}2=20\frac m {s^2}\\ \\ d=5\times 120+\frac{20\times 120^2}2=144600m[/tex]