17. Five mark example problem III

A boy of height \(90 \ cm\) is walking away from the base of a lamp post at a speed of \(1.2 \ m/sec\). If the lamp post is \(3.6 \ m\) above the ground, find the length of his shadow cast after \(4\) seconds.

 

Answer:

 

The length of the shadow of the boy after \(4\) seconds \(=\)  \(m\)