Correct: unit of velocity is m/s, V f =V i +at f, X f =X i +v i t f + 1/2at f 2, velocity is vector quantity, v f 2 =v i 2 +2a(x f - x i ), Incorrect: unit of velocity is m/s 2, V f =V i -at f, X f =X i -v i t f - 1/2at f 2, velocity is scalar quantity, v f 2 =v i 2 -2a(x f - v i ),

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