Hitunglah energi kinetik yang dimiliki oleh: a.benda 3 kg bergerak dengan kecepatan 10 m/s, b.mobil 2.500 kg bergerak dengan kecepatan 72 km/jam c.bola 80 g bergerak dengan kecepatan 15 m/s
Ezky
Rumus EK = mv² a. = 3x10² = 300 = 150 joule b. = 2500x72² = 2500x5184 = 1/2 x 12.960.000 = 6.480.000 joule c. = 0,08x15² = 1/2 0,08x225 = 1/2 x 18 = 6 joule
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KhansaNaura30
A. Ek = 1/2 x m x v² = 1/2 x 3 kg x (10 m/s)² = 1/2 x 3 x 100 = 150 J b. Ek = 1/2 x m x v² = 1/2 x 2500 kg x 72 km/jam = 1/2 x 2500 kg x 20 m/s = 1/2 x 2500 kg x (20 m/s)² = 1/2 x 2500 x 400 = 500000 J = 500 kJ c. Ek = 1/2 x m x v² = 1/2 x 80 g x 15 m/s = 1/2 x 0,08 kg x (15 m/s)² = 1/2 x 0,08 x 225 = 9 J
a. = 3x10²
= 300
= 150 joule
b. = 2500x72²
= 2500x5184
= 1/2 x 12.960.000
= 6.480.000 joule
c. = 0,08x15²
= 1/2 0,08x225
= 1/2 x 18
= 6 joule
= 1/2 x 3 kg x (10 m/s)²
= 1/2 x 3 x 100
= 150 J
b. Ek = 1/2 x m x v²
= 1/2 x 2500 kg x 72 km/jam
= 1/2 x 2500 kg x 20 m/s
= 1/2 x 2500 kg x (20 m/s)²
= 1/2 x 2500 x 400
= 500000 J = 500 kJ
c. Ek = 1/2 x m x v²
= 1/2 x 80 g x 15 m/s
= 1/2 x 0,08 kg x (15 m/s)²
= 1/2 x 0,08 x 225
= 9 J
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