A man runs towards mirror with a speed of 20m/s then the speed of his image with respect to himself will be

Zero

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30 m / s

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10 m / s

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100 m / s

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Solution

The correct option is B $30 m / s$
Let $v_{I}$ be the velocity of the image
$v_{P}$ be the velocity of the person.
$v_{I P}$ be the velocity of the image with respect to the person.
$v_{I P} = v_{I} - v_{p} = (v - (- v)) = 2 v Speed of image wrt person is v_{I P} v_{I P} = 2 v = 2 \times 15 = 30 m / s$

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