19 With the sun directly overhead an airplane takes off at a

19.

With the sun directly overhead, an airplane takes off at a speed S of 220 mph at a angle of 15 degrees above the horizontal. How fast is the airplane\'s shadow moving along the runway?

The airplane\'s shadow is moving at ______ mph.

Solution

It is moving at a speed of 220cos15=212.5

The airplane\'s shadow is moving at 212.5 mph