While a Car Is Stopped at a Traffic Light in a Storm

Multiple Choice

While a car is stopped at a traffic light in a storm, raindrops strike the roof of the car. The area of the roof is 5.0 m². Each raindrop has a mass of 3.7 × 10^-4 kg and speed of 2.5 m/s before impact and is at rest after the impact. If, on average at a given time, 150 raindrops strike each square meter, what is the impulse of the rain striking the car?

A) 0.69 N . s
B) 0.046 N . s
C) 0.14 N . s
D) 11 N . s
E) 21 N . s