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Dit : |v| = ...?
Peny :
v = ∫a dt
= ∫(2t) i + 4j dt
= t² i + 4t j
t = 3s
v = t² i + 4t j
= (3)² i + 4(3) j
= 9 i + 12 j
|v| = √(vx² + vy²)
= √(9² + 12²)
= √(81 + 144)
= √(225)
= 15 m/s
SELESAI