Car's shadow


As Curtis drives from McDonalds at 5
m/sec, his daughter notes that as the distance
between the car and the light increases, the shadow
of the car gets longer. She knows that this is due to
the changing angle made by the pole, the car and the light. She
is curious about how fast this angle changes one second after
starting to leave.
What is known:
 The height of the pole is 4 m.
 The height of the car is 1.5 m.
 The speed of the car is 5 m/sec.
