Explanation:
gravitational force or gravity is the force of attraction between objects that have mass.
frictional force is the forec that opposes motion (movement) when two surface are in contact. (acts in the opposite direction of motion)
so to sum it up,
- gravtional force is the force of attraction between objects that have mass.
- objects on the earth have weight because of gravitational force between them and the earth.
frictional force
- oppose motion
- slow down and stop moving objects and;
- produce heat
hope it helps :)
Ware them down, its like rubbing two pieces of chalk together.
Answer: 271.4 s
Explanation:
We are told the top speed (maximum speed)
the car has is:
taking into account 
And the car's average acceleration
is:

Since:
(1)
Where:
is the car's final speed (top speed)
because it starts from rest
is the time it takes to reach the top speed
Finding this time:
(2)
(3)
(4)
Now we have to find the distance
the car traveled at this maximum speed with the following equation:
(5)
Isolating
:
(6)
(7)
(8)
On the other hand, we know the total distance
traveled by the car is:
Hence the remaining distance is:
(9)
(10)
So, we can calculate the time
it took to this car to travel this remaining distance
at its top speed
, with the following equation:
(11)
Isolating
:
(12)
(13)
(14)
With this time
and the value of
calculated in (4) we can finally calculate the total time
:
(15)
(16)
I'm sorry, but this is not a question. What do you need to know?