Point 1 is PROBABLY higher up than point 4.
Another possibility is that on the way from Point 1 to point 4,
a lot of people are falling out of the coaster.
We have no way to tell, because you neglected to show us
the picture that goes with this question. It's important.
Answer:
it would take 100s for the train to crossthe bridge
Answer:
A ball moving until gravity pulls it back down to the ground
Explanation:
You would have to place your sensor above earth's atmosphere because it blocks out nearly all x-rays. this is why we have the Chandra observatory
hope this helps
