500
An easy way to work it out is to just add on another 0
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If he started out from "rest" (zero speed), then his average acceleration for the 5 seconds is50/5 = 10 meters per second2
The number of laps is50/(length of one lap on the track you choose)
28 000 000 000 2.8 * 1010
The expression "7 times 10 times 10 times 10 times 10" can be simplified using exponents. It can be rewritten as (7 \times 10^4), since there are four factors of 10 being multiplied together. Thus, the final result is (7 \times 10^4 = 70,000).
1000