The driving force on the train was 1200N how large must be the force applied in order to stop the train?

Answer is in the photo. I couldn't attach it here, but uploaded it to a file hosting. link below! Good Luck!

cutt.ly/kzH1l58

this is a good question! i'll do some research and come back when i have the answer!

in this image, you can see solar radiation going through ocean water.

no image, but probably absorption