A man of height \( 1.2 \) meters walks away from a lamp hanging at a height of 4 metres above gr...

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A man of height \( 1.2 \) meters walks away from a lamp hanging at a height of 4 metres above ground level. If the man walks with a speed of \( 2.8 \mathrm{~m} / \mathrm{s} \), determine the speed of the tip of mans shadow.
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