Tolong dibantu ya.. secepatnya sma caranya ya,, mksh,, Ini soalnya,,
Sebuah mobil bergerak lurus dengan kelajuan 100 km/jam selam 45 menit, kemudian kelajuannya berubah menjadi 90 km/jam selam 30 menit, kemudian 50 km/jam selama 15 menit, kelajuan rata-rata mobil tersebut adalah . . .
jimssteven33
Kelajuan rata rata=JUmlah jarak ditempuh/jumlah waktu tempuh =V1=100km/jam t1=45menit/0.75 jam s1=V1xt1=100x0.75=75KM =V2=90km/jam t2=30menit/0.5jam s2=90 x 0.5=45KM =V3=50km/jam t2=15menit=0.25jam s3=50x0.25=12.5km ΔS=75+45+12.5=132.5 Δt=45+30+15=1.5jam Vrata²=ΔS/Δt=132.5/1.5=88.3km/jam
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jejeala22=V1=100km/jam t1=45menit/0.75 jam s1=V1xt1=100x0.75=75KM =V2=90km/jam t2=30menit/0.5jam s2=90 x 0.5=45KM =V3=50km/jam t2=15menit=0.25jam s3=50x0.25=12.5km ΔS=75+45+12.5=132.5 Δt=45+30+15=1.5jam Vrata²=ΔS/Δt=132.5/1.5=88.3km/jam
=V1=100km/jam t1=45menit/0.75 jam s1=V1xt1=100x0.75=75KM
=V2=90km/jam t2=30menit/0.5jam s2=90 x 0.5=45KM
=V3=50km/jam t2=15menit=0.25jam s3=50x0.25=12.5km
ΔS=75+45+12.5=132.5 Δt=45+30+15=1.5jam
Vrata²=ΔS/Δt=132.5/1.5=88.3km/jam
=V2=90km/jam t2=30menit/0.5jam s2=90 x 0.5=45KM
=V3=50km/jam t2=15menit=0.25jam s3=50x0.25=12.5km
ΔS=75+45+12.5=132.5 Δt=45+30+15=1.5jam
Vrata²=ΔS/Δt=132.5/1.5=88.3km/jam