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

Question

A railroad diesel engine weighs four times as much as a freight car. If the diesel engine coasts as 5 km/h into a freight car that is at rest, how fast do the two coats after they couple?

Answer 1

This is a momentum question.

Momentum = mass x speed

So, the original momentum is contained solely withing the moving engine and equals 4 units of mass times 5 km/h. This equals a 'momentum' of 20.

The final momentum equals the combined mass of the engine and freight car, which is 4 units plus 1 unit for a total of 5 units of mass.

So, if Momentum = mass x speed, then since our final momentum is 20 (the same as the original momentum) and our final mass is 5, then 20 = 5 x Speed

Dividing both sides by 5 yields a final speed of 4 km/h.

Best wishes and good luck.

Answer 2

take this answer for your instructor....... **** for brains, a Loco (even a backyard mule) weighs far more effective than 4X a freight automobile, even no matter if that is full of depleted uranium. forget the maths that is the authentic international there's a static potential that must be conquer to get the ingredient transferring again. now to not instruct that there is team spirit of the metallic wheels and the metallic song and the noise and warm temperature it really is generated even as they SLAM into each and each and every-different yet your stupid instructor is searching for 16.5km it really is why he's practise because the purely ingredient "they" ever done replaced right into a practise degree. Its cald conservation of potential yet there is a good number of losses that "instructor" forgot about Remeber that once you get out of highschool....... that is going to likely be time to study the trueth all yet again The Procrastinator ..... that query replaced into to ordinary purely to provide the the finest option answer to..........