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v(t) = (2t+5)i + 4j
Sehingga, untuk t = 0
v(0) = 5i + 4j
Untuk t = 2
v(2) = (2(2)+5)i + 4j
v(2) = 9i + 4j
Ambil selisihnya,
9i + 4j - (5i + 4j)
= 4i + 0j
Resultan 4 m/s
Dengan selang 2 s
v = 4/2
v = 2 m/s