The Rest Energy of a Block Is E₀

question 3

Multiple Choice

The rest energy of a block is E₀. Relative to inertial observer O, the block is moving with speed v so that

-Observer O finds that the block takes 12 s to go from A to B. How long would this time interval appear to be to an observer riding on the block?

• A)3 s
• B)6 s
• C)12 s
• D)24 s
• E)48 s