Question

Dau 86 pcte plz am nevoie
Problema cu masina
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Answer 1

v₁=d₁/t₁=>t₁=d₁/v₁=6000m/2m/s=3000s=>t₁=50min
v₂=d₂/t₂=>t₂=d₂/v₂=4000m/4m/s=1000s=>t₂=16min40sec

Vm=d/t=(6000+4000)m/(3000+1000)s=10000/4000=>Vm=2,5m/s

Answer 2

$\normalsize Se~da:\\ \\d_{1}=6km=6000m\\ \\v_{1}=2\frac{m}{s}\\ \\d_{2}=4km=4000m \\ \\v_{2}=4\frac{m}{s}\\ \\a)t_{1};t_{2}=?s\\ \\b)v_{m}=?\frac{m}{s}\\ \\ \\Formule:\\ \\a)t=\frac{d}{v}\\ \\t_{1}=\frac{d_{1}}{v_{1}}\\ \\t_{2}=\frac{d_{2}}{v_{2}}\\ \\ \\b)v_{m}=\frac{d}{t}\\ \\v_{m}=\frac{d_{1}+d_{2}}{t_{1}+t_{2}}\\ \\ \\Calcule:\\a)t_{1}=\frac{6000}{2}=3000s\\ \\t_{2}=\frac{4000}{4}=1000s\\ \\ \\b)v_{m}=\frac{6000+4000}{3000+1000}=2,5\frac{m}{s}$