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= La1/La2
= phi x r1²/phi x r2²
= 6²/9²
= 36/81
= 4/9 = 4 : 9
b. V2 - V1 = (La2 - La1) x t
= (254,34 - 113,04) x 17
= 141,3 x 17
= 2402,1