A Lamp Is 3 Metres High on a Post Located

Multiple Choice

A lamp is 3 metres high on a post located 5 metres from a vertical wall. A 2 metre tall man walks toward the wall from the lamppost on a path perpendicular to the wall. He is walking at a rate of 1 metre per second. When he is 1 metre from the wall, how fast is the shadow of his head moving up the wall?

A) 0.31 metres per second
B) 0.52 metres per second
C) 1.29 metres per second
D) 0.96 metres per second
E) 0.36 metres per second