Answer: 
Explanation:
Given
mass of laptop m=2 kg
The velocity of car u=8 m/s
The coefficient of static friction is 
The coefficient of kinetic friction is 
As the car is moving, so the coefficient of kinetic friction comes into play
deceleration offered by friction 
Using the equation of motion 
insert the values

It is like that, except most nails are steel or stainless steel, slowing to rusting process to about 5 years.
Im not so sure but it should be the
instantaneous speed