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= 45 - 4
= 41 rad/s²
= t³ + 2t² - 4
= 3t² + 4t
pada saat (t = 3 s) maka:
= 3t² + 4t
= 3 (3)² + 4 (3)
= 3 . 9 + 12
= 27 + 12
= 39 Rad/s²
Jawabannya C