Physic:Calculating mass of one rail car?

[okgo]

Physic:Calculating mass of one rail car?
http://www.screencast.com/users/trinhn812/folders/Jing/media/0852e68e-acef-49b1-a54d-39289386b978

I'm confused. Why isn't it 10000N/10car=1000N*1m/s^2=1000kg

Isn't the force The force exerted on the 11th car is moving 10 cars, not just one.

 

[PhanthomJay]

Physic:Calculating mass of one rail car?
http://www.screencast.com/users/trinhn812/folders/Jing/media/0852e68e-acef-49b1-a54d-39289386b978

I'm confused. Why isn't it 10000N/10car=1000N*1m/s^2=1000kg

this equation is very confusing

Isn't the force The force exerted on the 11th car is moving 10 cars, not just one.

yes, who checked off 'c'?

 

[okgo]

It was a practice exam online with the answer key. I guess I will tell the professor