iday
Dari soal di dapat : X = 1,4.t^2 + 0,15.t^3 a) kecepatan rata-rata : t = 0 ampe t = 10 s Vrata = ΔX/Δt = ((1,4.(10)^2 + 0,15.(10)^3) - 0)/10 - 0 = (140 + 150)/10 = 29 m/s
b) kecepatan sesaat itu turunan dari X : V(t) = 2,8.t + 0,45.t^2 jadi, .. *) t = 0 --> V(t=0) = 0 **) t = 5 s --> V(t=5) = 2,8.(5) + 0,45.(5)^2 = 14 + 11,25 = 25,25 m/s ***) t = 10 s --> V(t=10) = 2,8.(10) + 0,45.(10)^2 = 28 + 45 = 73 m/s
X = 1,4.t^2 + 0,15.t^3
a) kecepatan rata-rata : t = 0 ampe t = 10 s
Vrata = ΔX/Δt = ((1,4.(10)^2 + 0,15.(10)^3) - 0)/10 - 0 = (140 + 150)/10 = 29 m/s
b) kecepatan sesaat itu turunan dari X :
V(t) = 2,8.t + 0,45.t^2
jadi, ..
*) t = 0 --> V(t=0) = 0
**) t = 5 s --> V(t=5) = 2,8.(5) + 0,45.(5)^2 = 14 + 11,25 = 25,25 m/s
***) t = 10 s --> V(t=10) = 2,8.(10) + 0,45.(10)^2 = 28 + 45 = 73 m/s