A is not linked. Coal burning is not an effect of acid rain.
~Deceptiøn
Answer:
there is no drag in a vacuum (why is father in a vaccum)
Explanation:
there is nothing to hit and slow the object other than gravity like dust or air
Answer:
The seed as a fraction of the speed of light is 
Solution:
As per the question:
Suppose,
be the rate of an identical clock between two time intervals.
For a moving clock, moving with velocity 'v', at the clock tick of four-fifth:
t = 
Now,
Using the relation of time dilation, from Einstein's relation:


Squaring both sides:



We would calculate the magnitude by applying pythagorean theorem:



The angle between two vectors is given by the formula:

In two dimensional, the x axis of vector form is:








Answer is B
Hope this helped!