Question

Cum se calcula viteza medie daca avem doua viteze difrerite si doua timpuri diferite ?

Answer 1

Salut,

$v_{medie}=\dfrac{d_{total\breve{a}}}{t_{total}}=\dfrac{d_1+d_2}{t_1+t_2}=\dfrac{v_1\cdot t_1+v_2\cdot t_2}{t_1+t_2}.$

Green eyes.

Answer 2

d=vm*t

d=d₁+d₂

t=t₁+t₂

v₁=d₁/t₁=>t₁=d₁/v₁

v₂=d₂/t₂=>t₂=d₂/v₂

vm=d/t=(d₁+d₂)/(d₁/v₁+d₂/v₂)=(d₁+d₂)/[(v₂d₁+v₁d₂)/(v₁v₂)]=v₁v₂(d₁+d₂)/(v₂d₁+v₁d₂)