Describe two shortcomings of the pennium model for isotopes

let me know when u find out plz because i would like to know as well its one of my chemistry qustions in an assiment. :)

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 : )

the answer is option a.