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untuk t=3 ->
untuk t=2 ->
v=46-21 = 25 m/s
v=(r2-r1) / (t2-t1)
t1=2 => r1= 5×2^2 +1 = 21
t2=3 => r2= 5×3^2 + 1= 46
v= (46-21) / (3-2) = 25 m/s