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You don't. You solve it. u - v^2 - u + v^2 = 0
You solve the equation for kinetic energy for mass. KE = (1/2) m v2 (1/2) m v2 = KE m = 2 KE / v2
2 16/25 = 2.64
There is nothing to solve! 2.12 = 212/100 = 53/25
25% = 0.2560.5 x 0.25 = 15.125