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khaylaperry
01.12.2019 •
Mathematics
James covers a distance of 8 meters in the first second of a 100 meter race. then, he sprints at a speed of 9 meters per second. how far is james from the finish line 9 seconds after the race has started? .
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Ответ:
d = r x t
9 sec after the race started is 8 sec after
he started sprinting
d=9.8
d=72
So, he has gone 8 + 72= 80 m
That means he is 100 - 80 = 20 m from the finish line.
Putting into a formula:
Let,
d = distance from the finish line after 9 sec
d=100-(9(9-1)) - 8
d= 20 m
Ответ:
D
Step-by-step explanation: