Kinematics Question 341

Question: A man of height h walks in a straight path towards a lamp post of height H with velocity v. Then velocity of the edge of the shadow on the ground will be

Options:

A) hvH+h

B) HvHh

C) H+hHv

D) (Hh)Hh

Show Answer

Answer:

Correct Answer: B

Solution:

as ΔLOS and ΔMPS are similar so, Hx=hxy(Hhz)x=Hy
(Hh)dxdt=Hdydy=Hv
VS=HvHh



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