A 4000 kg open train car is rolling on frictionless rails at 21.5 m/s when it st

Question

A 4000 kg open train car is rolling on frictionless rails at 21.5 m/s when it starts pouring rain. A few minutes later, the car's speed is 20.0 m/s.

Part A

What mass of water has collected in the car?

Express your answer to three significant figures and include the appropriate units.

A 4000 kg open train car is rolling on frictionless rails at 21.5 m/s when it starts pouring rain. A few minutes later, the car's speed is 20.0 m/s.

Part A

What mass of water has collected in the car?

Express your answer to three significant figures and include the appropriate units.

Explanation / Answer

Momentum before = MOmentum after

4500*21.5 = (4500+m)*20

m = 337.5 Kg

Mass of Rain=337.5kg

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