physics

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You and a friend are playing a game of squirt-gun tag in a maze. Suddenly you see your friend's image in a small planar mirror. You take a shot over the barrier in front of you and find that your friend is just at the end of the 7.0 m range of your squirt gun. If you are 4.0 m from the point of reflection of the light ray, how far from the point of reflection of the light ray is your friend? answer in meters.

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