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x = 2t+t^3
v = 2+3t^2
untuk t = 0
v = 2+3(0)^2 = 2m/s
untuk t = 3
v = 2+3(3)^2 = 29m/s
nomor 2 bagian a
x = 2t^3+5t^2+5
v = 6t^2+10t
a = 12t+10