Why is it not advisable to use dilute nitric (v) acid in preparation of hydrogen gas

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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in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.