An unknown radioactive element appears to have a half-life of 5.0 minutes. How much of a 2.0000 gram sample will remain undecayed after 20 minutes?

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 : )

gold is my favorite solid.