1.

Paragraph: The rest energy of a block is E_(0). Relative to inertial observer O, the block is moving with speed v so that sqrt(1-v^(2)//c^(2))=1//4. Observer O finds that the block takes 12s to go from A to B. How long would this time interval appear to be to an observer riding on the block?

Answer»

3s
12s
6s
24s

Answer :A


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