Jawaban:
W = -375 J
Penjelasan:
v₀ = 72 km/jam = 72000/3600 m/s
v₀ = 20 m/s
Usaha
W = 1/2.mv² - 1/2.mv₀²
W = 1/2. 2.5² - 1/2. 2. 20²
W = 25 - 400
72km/jam=20 m/s
W=EK2-Ek1
W=1/2mv^2
=1/2x2x(5^2-20^2)
=-375 Joule
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Jawaban:
W = -375 J
Penjelasan:
v₀ = 72 km/jam = 72000/3600 m/s
v₀ = 20 m/s
Usaha
W = 1/2.mv² - 1/2.mv₀²
W = 1/2. 2.5² - 1/2. 2. 20²
W = 25 - 400
W = -375 J
72km/jam=20 m/s
W=EK2-Ek1
W=1/2mv^2
=1/2x2x(5^2-20^2)
=-375 Joule