A man is running with a speed 8 m/s constant in magnitude and direction passes under a lantern hanging at a height 10 m above the ground. Find the velocity which the edge of the shadow of the man's head moves over the ground with if his height is 2 m.
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Ans. 0010
Sol. 
x man = vt
= 
= 
⇒ x head = 
x man
= 
vt
Velocity of shadow of head = 10 m/s
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