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t = 0,5 s
v = ?
v (t) = dr/dt
v (t) = d (2t²-4) i +(t²+5) j / dt
v (t) = 4t i + 2t j
v (0,5) = 4 (0,5) i + 2 (0,5) j
v (0,5) = 2i + j
besar v adalah
v = √2² + 1²
v = √5 m/s