Question

Asked Mar 18, 2019

A railroad diesel engine weighs four times as much as a freight car.

If the diesel engine coasts at 4.0 km/h into a freight car that is intitally at rest, find the speed of the coupled cars. Express you answer to two significant figures and include appropriate units.

Step 1

The equation for the conservation of linear momentum of the engine-car system is,

Step 2

Since the initial speed of the car is zero,

Step 3

The final spe...

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