Complete Question
The complete question is shown on the first uploaded image
Answer:
The distance which the car skid is 
Explanation:
From the question we are told that
The initial velocity of the car is 
The coefficient of kinetic friction is 
According to the law of energy conservation
The initial Mechanical Energy = The final Mechanical Energy
The initial mechanical energy is mathematically represented as

where KE is the initial kinetic energy which is mathematically represented as

And PE is the initial potential energy which is zero given that the car is on the ground
Now

Where
is the work which friction exerted on the car which is mathematically represented as

Where
is the distance covered by the car before it slowed down

=> 
Answer:
F=m(a) 3.111
Explanation:
So to find the acceleration you would have to reverse the problem, a=F/m
1. Giga is the largest
2. Stem-and-leaf
Thick lens will have shorter and consequently thin lens will have greater focal length. Because, For a thick lens, the optical path length of the light is more, than for a thin lens, thus, the bending of light will be more in case of a thicker lens. Consequently, it has a shorter focal length.