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W = m.a.s = 2 x 2 x s
cari s terlebih dahulu,
s = vot + 1/2at^2
s = 1/2 x 2 x 16 = 16 m
W = 2 x2x16 = 64 J
m = 2 kg
a = 2m/s2
t = 4 s
Vo = 0 m/s
Ditanyakan : W ?
Dijawab :
S = Vot + 1/2 a t²
= 02x + 1/2 x 2 x 4²
= 16 m
Usaha :
W = F x s
= m x a x s
= 2 x 2 x 16
= 64 J