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r = 4t² + 2t - 10
Dit :
v = ....? t = 2s
Peny :
v = dr/dt
= d/dt (4t² + 2t - 10)
= 8t + 2
untuk t = 2s
v = 8t + 2
= 8(2) + 2
= 16 + 2
v = 18 m/s <--- Jawaban
SOLVED :)