# A 1 kg mass has a kinetic energy of 1 joule when its speed is:A. 0.45 m s–1B. 1 m s–1C. 1.4 m s–1D. 4.4 m s–1

Given,

Mass of body m= 1 kg

Kinetic energy = 1 J

Velocity v=?

Kinetic energy = m v2

Substituting the given values in the equation:

1 J = ×1× v2

1×2 = v2

v2 = 2

v=

v= 1.4 ms-1

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