A man, 1.8m tall, stands before a plane mirror. What should be the minimum height of the mirror so that he can see his image from head to toe ? Assume that the level of the eye represents his height.?????????
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U = 72 km/h = 20 m/s
v = 0 km/h = 0 m/s.
By work energy theorem, we know
W = 1/2 mv^2 - 1/2 mu^2
W= 1/2 × 1000 × -400
= -200,000 J.
The minus sign indicates force and displacement are opposite to each other.
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