Answer:
For a plant cell: The cell wall and the cell membrane
For animal cells: Just the cell membrane
You continue moving forward, and you HOPE that some of the other
people in your Physics class are seeing this, because it's a great
demonstration of Newton's First Law of Motion.
Answer:
The mass is 
Explanation:
Generally from Newton law for the first block
=>
For the second block the force is
and the acceleration is 
So from Newton law
=> 
substituting for a
=> 
=> 