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pd saat t = 4 maka r = 8i + 4j
v rata2 = Δr/ Δt
= (8i+4j)-4j / (4-0) = 8i/4 = 2i m/s
b. fungsi kecepatan adl turunan pertama dr r sehingga
v = 2 m/s
kec awal Vo = 2m/d