Part a)
As we know that

here we know that
P1 = 20 bar
V1 = 0.5 m^3
V2 = 2.75 m^3
from above equation


so final state pressure will be 2 bar
Part b)
now in order to find the work done





Answer:
Action and reaction are the same
Explanation:
Let us carefully analyze the situation in the context of Newton's third law, when the car hits the mosquito exerts a force that acts on the mosquito, ACTION and the mosquito responds to the force that is being applied with a force of equal magnitude and direction or opposite applied to the car (Reaction).
Consequently, the correct answer is: The force of the car on the mosquito is of the same magnitude as that of the mosquito on the car
The complete and comprehensive solution is attached.
Explanation:
It is given that,
The horizontal speed of a cliff diver, 
It reaches the water below 2.00 s later, t = 2 s
Let
is the distance where the diver hit the water. It can be calculated as follows :

Let
is the height of the cliff. It can be calculated using second equation of motion as follows :

So, the cliff is 19.6 m high and it will hit the water at a distance of 19.6 m.