If 12.0 grams of c combines completely with 32.0 grams of o to form a compound, what is the percent composition of o in the compound?

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

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catya your not at all which answer i've seen you do this on another question!