- #1

onetroubledguy

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**In order to qualify for a racing event, a race car must achieve an average speed of 278km/h on a track with a total length of 1260m.**

If a particular car covers the first half of the track at an average speed of 209km/h, what minimum average speed must it have in the second half of the event in order to qualify? Answer in unts of km/h.

If a particular car covers the first half of the track at an average speed of 209km/h, what minimum average speed must it have in the second half of the event in order to qualify? Answer in unts of km/h.

So, I assume I have to split this up into two parts. The first half of the track he covers a distance of 630m at 209km/h or 58.05m/s. From there, you can derive a time of 10.85s (is time even needed?). But where do I go from here? For the second half of the track you you only know the distance. Which equation would I use to find missing variables?

Also, could you explain why 278 = (209+v)/2 wouldn't work?

Thank you.