A7500 kg open train car is rolling on frictionless rails at 25.0 m/s when it starts pouring rain. a few minutes later, the car's speed is 20.0 m/s. what mass of water has collected in the car?

Mass of rain collected will be 1875 kg

Explanation:

We have given mass of the train = 7500 kg

Velocity of the car = 25 m/sec

After few minutes velocity of the car = 20 m/sec

From conservation of momentum we know that

So

will be sum of mass of car and mass of rain collected

As mass of car is 7500 kg

So mass of rain collected = 9375 - 7500 = 1875  kg

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