That looks like you are evaluating a function, called "v", at two different values and subtracting. You can't calculate that, and you can't even find a simplification for the indicated subtraction, unless you know more about how the function "v" is defined.
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The answer depends on the function v, for which there is no information in the question.
You don't. You solve it. u - v^2 - u + v^2 = 0
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You solve the equation for kinetic energy for mass. KE = (1/2) m v2 (1/2) m v2 = KE m = 2 KE / v2
v2- u 2 = 2assince, S (Distance) = Average speed x TimeS = U+V / 2 * TS = U+V / 2 * V - U / A {since T = V -U / A}S = V2 - U2 / 2A2AS = V2 - U2OR V2 - U2 = AsHence, Derived.
Vresultant = V1 + V2