A man 150 cm tall, walks away from a source of light situated at the top of a pole 5 m high at the rate of 0.7 m/s. Find the rate at which:
- his shadow is lengthening
- the tip of his shadow is moving
when he is 2 m away from pole.
My attempt: I found the rate at which his shadow is lengthening by using the property of similar triangles and by differentiating. However, for the 2nd part, I could not figure out the rate to be found. Can anyone help me out?