- #1
Krashy
- 30
- 5
Homework Statement
Homework Equations
[/B]Equations of motion:
v = u + at
s = 1/2 (u + v) t
s = ut + 1/2at^2
v^2 = u^2 + 2as
3. The Attempt at a Solution
Hello, on a i used the 2nd equation:
30m = 1/2 (3*10^8m/s+3*10^8m/s) t so -> t = 1*10^-7s
but to get the correct solution i need to take t*2 i think. I made a small sketch to this question, but i don't really know why i need to take it times 2, is it because of sending and receiving the signal?
I hope someone can explain this to me.b was a lot more confusion for me because of the two time values:
first i used s = v*t
s = 3*10^8m/s * 2.14 * 10^-7s so -> s = 64.2m
this is where i get lost, so now i used the 2nd equation again with the other time value:
64.2m = 1/2 (0m/s + final velocity) * 0.1s so -> v (final velocity) = 1284 m/s
so I am pretty sure that's waaay to high, but i think the first part is correct.
Thanks for every answer.