(3) The frictional force exerted by the floor on the box
The change in velocity is +4 m/s to the right (or -4 m/s to the left).
The object's mass is irrelevant.
As the speed increases and the pressure decreases
Answer:
Increase by a factor of 4.
Explanation:
The acceleration of a car moving with speed v in a circle of radius R is given by:

Now if we double the speed
in the equation above, it becomes
. Thus:

Therefore the acceleration is increased by a factor of 4.