Seorang pembalap profesional mempercepat laju kendaraannya dari 234km/jam menjadi 257 km/jam . Jika massa kendaraan 2500 kg. Usaha yg dilakukan pembalap adalah........joule
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Vo = 234 km/jam = 65 m/s
Vt = 257 km/jam = 71,39 m/s
m = 2500 kg
W = ?
W = Δ Ek
W = 1/2. m (Vt^2 - Vo^2)
W = 1/2.2500 (5096,5321 - 4225)
W = 1250 (871,5321)
W = 1089415,125 J
semoga membantu ^_^