5. A journey takesh at a speed of 45 km/h. How long will the same journey take ***
speed of 25 m/s?
[Hint: 25 m/s =
18
25 X
km/h = 90 km/h)
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The theory of relativity usually encompasses two interrelated theories by Albert Einstein: special relativity and general relativity. Special relativity applies to all physical phenomena in the absence of gravity. General relativity explains the law of gravitation and its relation to other forces of nature.
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