October 2018 1 79 Report
Persamaan posisi suatu gerak adalah r = (2t² + t + 2) i + 2tj . pada saat posisi r = 12 i + 4 j tentukan kecepatannya. Opsi pilihan :
A. 9i + 2j.
B. 6i + 9j
C. 2i + 9j.
D. 9i + 6j
E. 2i + 6j
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