The speed of a falling raindrop is 10 m/s. The weather forecast predicts 10 mm of rain in the next hour. If you go out with an umbrella of radius 70 cm, approximately what is the force of the rain hitting your umbrella?
A. 0.0002 N
B. 0.0004 N
C. 0.002 N
D. 0.004 N
E. 0.02 N
F. 0.04 N