This is what I have to do. I dont get it, I've tried and tried. Contacted my teacher and still dont get it. Please help. I'm frustrated.

Question

The projectile’s mass is not needed.
 The projectile must be launched on the horizontal plane.
 The earth drops 8 inches for every mile traveled.
 The acceleration due to gravity is 9.81 meters per second squared.
 Ignore air resistance.
You will have to calculate how far an object drops every second due to gravity

How fast does an object need to travel to stay in orbit for two seconds?
How fast does an object need to travel to stay in orbit for three seconds?

Answer 1

Please be careful to state the problem for us the way it was presented to you.
I am sure your physics teacher did not say that this projectile was "in orbit" because it is not. I also do not trust the mixture of inches and meters.
Anyway the horizontal velocity is constant, period. Call it u
Now how far does it fall in two seconds?
h = (1/2)g t^2 = (1/2)(9.81)(4) = call it h in meters (about 20 meters but you calculate)
now how far is that away at the given slope of (8/5280*12)
d = 20 (5280*12/8)
so the speed is d meters/ 2 seconds

Answer 2

Thanks

Answer 3

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