tolong dibantu tugas kelas 9 fisika nomor 5 sampai 9:)plisss

No 7 v = 54 km/jam = 54.000 m / 3600 s = 15 m/ s Ek = 1/2 × m × V ^2 = 1/2 × 70 × 15 × 15 = 7875 J No 8 W = F × s = (300+600) × 5 = 4500 J No 9 KM = w / f = 90 / 60 = 1,5 W × h = F × s 90 × 2 /60 = s 3 m = s No 6 s = Vo × t + 1/2 × a × t^2 = 30 × 10 + 1/2 × 5 × 10 × 10 = 300 + 250 = 550 m