Answer:
C. Equals
Explanation:
Law of reflection Equals the angle of incidence
The answer would be C.30J
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:


Time = distance/speed
thus = 10/40
which comes to 1/4th of the hour that's 60/4 which is 15 minutes
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