Complete Question
The complete question is shown on the first uploaded image
Answer:
The dopant density is ND ≈ 8.135*10¹² cm⁻³
Explanation:
The explanation is shown on the second , third ,fourth and fifth uploaded image
The car will gain new momentum if it's velocity is doubled or tripled.
I’m pretty sure it is an object with a net force of zero. All forces are balanced and EQUAL
The average acceleration can be found by dividing the final speed by the time taken to reach said point so in this case you divide 60 by 8 resulting in 7.5 which will be your answer