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d = (15i + 25j ) m
F = (200i + 175j) N
W = __?
Usaha
W = F • d....perkalian titik (dot product,)
W = (200i + 175j) • (15i + 25j )
W = 200 • 15 + 175 • 25
W = 7375 J ← jwb
catatan
a = xa i + ya j
b = xb i + yb j
a• b = xa xb + ya yb