states that the number of transistors per square inch on an integrated chip doubles every 18 months.

Independent variable is something that is changed in a experiment. 

Ibelieve the answer you're looking for is

The correct answer should be b let me know if i’m wrong

F= (mass)(acceleration) = mam = 0.25 kgvi = 16 m/st = 2 svf = 0 m/s (since it was put to stop)a=(vf-vi)/ta=(0-16)/2a = 8 m/s^2 (decelerating)f = ma = (0.25 kg)(8 m/s^2)f = 2 nhope this !