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

question 28

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

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