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kecepatan
v = dx/dt
v = 15t² + 2
v (2) = 15 . 2² + 2
v (2) = 15 . 4 + 2
v (2) = 60 + 2 = 62 m/s
percepatan
a = dv/dt
a = 30t
a (2) = 30 . 2 = 60 m/s²