Answer:
An object changes position if it moves relative to a reference point. The change in position is determined by the distance and direction of an object's change in position from the starting point (displacement). Direction • Direction is the line, or path along which something is moving, pointing, or aiming.
Explanation:
Answer:
want
Explanation:
because it is not actually needed for the existence of life at that particular time
Answer:
d. Both kinetic and sliding friction
Explanation:
Kinetic friction, commonly known as sliding friction, happens when a body with its surfaces in contact is in relative motion with another. It's the frictional force slowing it down, and finally stopping a moving body. One can describe sliding friction as the resistance any two objects create while sliding against each other. It is often documented as the force required to hold a surface moving along another surface. It is determined by two variables- one is material of the object and another is its weight.
Complete Question
The complete question is shown on the first uploaded image
Answer:
The mass is 
Explanation:
From the question we are told that
The mass of the stars are 
The orbital speed of each star is 
The orbital period is 
The centripetal force acting on these stars is mathematically represented as

The gravitational force acting on these stars is mathematically represented as

So 
=> 
=> 
=> 
=> 
The distance traveled by each sun in one cycle is mathematically represented as



Now this can also be represented as

Therefore

=> 
=> 
So

=> 
=> 