Question

at what speed a body of mass 1 kg will have kinetic energy of 1 Joule

Answer 1

since kinetic energy =
$\frac{1}{2} m {v}^{2} \\ then \: \frac{1}{2} \times 1 \times {v}^{2} = 1 \\ then {v}^{2} = 2 \\ v = \sqrt{2}$
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Answer 2

answer is 1.44 metre/second