A man of height `h` is walking at constant speed `v_(0)` along edge of a straight horizontal road. There is a lamp post of height `H=2h` on the other edge as shown. If speed of tip of shadow of his head is `nv_(0)` then find `n`.

Answer

2

Explanation

`x=H/(H-h)I`
`y=(H/(H-h))y^'`
`(dx)/(dt)=0` & `(dy)/(dt)=(H/(H-h))V_(0)`