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r = 12t² - 48t + 16
r = 1,5 m = 1,5/100 = 0,015 cm
Dit : v = ...? t = 2s
Peny :
v = dr/dt
= d/dt (12t² - 48t + 16)
= 24t - 48
untuk t = 2s
v = 24t - 48
= 24(2) - 48
= 48 - 48
v = 0 m/s <--- Jawaban
v = r x v
= 0,015 x 0
= 0,015 m <--- Jawaban