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jawab =
a. v = x + y
= t² i + t³ j
= 3² i + 3³ j
= 9i + 27j m
b. percepatan/a = dv ÷ dt = d{(t²)i +(t³)j} ÷ dt = ti + t²j
a saat t=1 ⇒a = 1i + 1j m
a saat t= 3 ⇒a = 3i + 9j m
c. besar percepatan saat t=3 sec
[a] = √ 3² + 9²
= √ 9 + 81
= √90 m
maaf kalo da yang salah , semoga membantu