Question
A plane mirror is placed on a wall. A man walks directly
toward the mirror at 2 m/s. The speed at which his image approaches him is:Solution
In plane mirrors, the image appears the same distance behind the mirror as the object is in front. When the man moves at 2 m/s toward the mirror, the image moves 2 m/s toward him from the opposite side. So, the relative speed between man and image is 2 + 2 = 4 m/s.
Which of the following methods is suitable for preventing an iron frying pan from rusting?
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