4. Dark Energy.
This is the mysterious force causing the expansion of space. No one has ever seen this force.
Mass is not necessary the main thing we need is Displacement
As
Or
- Work done=Force×Displacement
The amount of work done is calculated as the force exerted to remove a object to D distance .
Answer:
The value is 
Explanation:
From the question we are told that
The mass of the car is
The period of the circular motion is 
The radius is 
Generally the frequency of the circular motion is

=> 
=> 
An atom's mass number equals the number of protons plus the number of neutrons.
Hope this helps! (: