Answer:
The duration is
Generally the time it would take for the message to get the the other civilization is mathematically represented as
Here c is the speed of light with the value
=>
=>
converting to years
Now the total time taken is mathematically represented as
=>
=> [tex]T =72 \ years /tex]
The answer is 0.025J.
W=1/2*k*x^2
W=1/2*20*0.050^2
W=0.025J
It moves horizontally across the floor.
C)Visible Light-the hint:Visible light.