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Characteristics of Image by a Plane Mirror

A particle mo...

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A particle moves perpendicular towards a plane mirror with constant speed 4 cm/s. What is the speed of the image observed by an observer moving along the same direction with constant speed 2 cm/s if the mirror is moving in opposite direction with speed 10 cm/s ? 1 4cm/ 2 12cm/s 3 14cm/s 4 26cm/s Assume that all the speeds are with respect to ground frame.

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