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Newton's Laws for System of Particles

A 1 kg mass h...

Question

A 1 kg mass has a kinetic energy of 1 joule when its speed is _______________.

A

1 m s^{- 1}

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B

4.4 m s^{- 1}

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C

1.4 m s^{- 1}

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D

0.45 m s^{- 1}

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Solution

The correct option is A $1 m s^{- 1}$
$K = \frac{1}{2} m v^{2}$
$G i v e n, K = 1 J a n d m = 1 k g s o,$
$1 = \frac{1}{2} \times 1 \times v^{2}$
$H e n c e v = 1 m s^{- 1}$

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