Which of these elements is the most chemically reactive? A zinc (Zn)
B. iron (Fe)
C. potassium (K)
D. germanium (Ge)

a zinc is the most reactive

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

hope this : )