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a = v/t
a = 8/4
a = 2 m/s²
kemudian cari jarak :
V² = V₀² + 2 a s
8² = 0² + 2 (2) s
64 = s
s = 64 / 4
s = 16 meter
kemudian cari W
W = F s
F = m a
W = m a s
W = (2) (2) (6)
W = 64 Joule
Atau dengan cara yang lain , menggunakan rumus EK , karena W = EK .
EK = ¹/₂ m v²
EK = ¹/₂ (2) (8)²
EK = 1 (64)
EK = 64
karena W = EK maka :
W = 64 Joule