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x=12i+8j
Dit : v = ...? t = 2s
Peny :
v = dx/dt
= d/dt ( 6t i + (8t - 2t²)j )
= 6 i + 8 - 4t j
= 6 i + 4t j
t = 2s
v = 6 i + 4t j
= 6 i + 4(2) j
= 4i + 8j m/s <--- Jawaban