Answer:
171.5 N
Explanation:
The gravitational force on an object due to the Earth is given by

where
m is the mass of the object
g is the acceleration due to gravity
The acceleration due to gravity at a certain height h above the Earth is given by

where:
G is the gravitational constant
 is the Earth's mass
 is the Earth's mass
 is the Earth's radius
 is the Earth's radius
Here, 

So the acceleration due to gravity is

We know that the mass of the object is
m = 70 kg
So, the gravitational force on it is

 
        
             
        
        
        
Answer:
C is the best answer because we all know that clock is part of our daily lives but we don't know the about its background 
 
        
                    
             
        
        
        
Answer: 
<u>Example of Newton's III law</u>
- In the, golf the ball was hit by a club with certain force. As the club hits the ball it's the action. When the ball flies away its the reaction. 
- When a person swings a golf club at the ball, when it hits the ball, it causes the ball to roll up the face of the club and into the air towards the target.
 
        
             
        
        
        
Vf = Vi + at
Vf = 0 + 5.4•28
 = 151.2m/s..
not sure if its right