Question

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

Answer 1

Quesion:

At what speed a body of mass 1kg have kinetic energy of 1joule

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$kinetic \: energy = \frac{1}{2} mv {}^{2}$

$1j = \frac{1}{2} \times 1kg \times v {}^{2} \\ 2j = 1kg \times v {}^{2} \\ \sqrt{2} = v$

Answer 2

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Actually Welcome to the Concept of the Kinematics of a body,

Basically we know that,

Kinetic energy of a body is given by,

K. E. = 1/2mv^2

so we get as

1 = 1/2 (1) v^2

v^2 = 2

so we get velocity as,

$v \: = \sqrt{2 } ms { - 1 }^{2}$

so, velocity = 1.71 m/s