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When running a 100 meter race Justin reaches his maximum speed when he is 35 meters from the starting line, and 7 seconds have elapsed since the start of the race. Justin continues at this max speed for the rest of the race and is 70 meters from the starting line 12 seconds after the start of the race.

What is Justin's max speed?

Suppose Justin runs for an additional 2 seconds after reaching his max speed...

How far will Justin travel during those 2 seconds?

 meters   

What is Justin's distance from the starting line 9 seconds after the start of the race?

 meters   

What is Justin's distance from the starting line 8.5 seconds after the start of the race?

 Jan 29, 2020
 #1
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Hi there...

Justin runs a 100meter race.
Justin reaches his maximum speed after running 35m in 7s.

After which he runs an additional "35m in 5s". <<---(Maximum speed).

For the next 2s he runs "X"m.

Which adds up to "(35m+"X"m)" in 9s and/or "(35m+((3/4)"X"m))" in 8.5s, away from the starting line.

 

I hope that helped?

 


Kind regards
BizzyX

 

PS...:

Unless you are meant to calculate acceleration, the first two lines are pretty useless calculation wise.
The only useful thing it tells you is "the distance from the starting line".
And that it was after this point in the race that he had reached his maximum speed, but it doesn't indicate the maximum speed.
For that you have to look at line three...
After that it's pretty simple math.


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 Jan 29, 2020
edited by BizzyX  Feb 6, 2020

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