Answer:
THE RUBBER BALL
Explanation:
From the question we are told that 
       The mass of the rubber ball is 
       The  initial  speed of the rubber ball is  
       The final speed at which it bounces bank 
       The mass of the clay ball  is  
        The  initial  speed of the clay  ball is 
        The final speed of the clay ball is  
Generally Impulse is mathematically represented as 
         
 
where  is the change in the linear momentum so
 is the change in the linear momentum so  
        
 For the rubber  is  
         
        
=>     
For the clay ball 
        
         
=>    
So from the above calculation the ball with the a higher magnitude of impulse is the rubber ball
        
 
 
        
             
        
        
        
Gravity is the correct answer.
 
        
             
        
        
        
Answer: b) The velocity vector is perpendicular to the acceleration vector; the acceleration vector is parallel to the net force vector. 
Explanation: A change in velocity creates an acceleration. As the object rotates through the circular path it is constantly changing direction, and hence accelerating, which causes a constant force to act upon the object. This Force acts towards the center of curvature, directly toward the axis of rotation in a direction parallel to the acceleration of the body along the path. Because the object is moving perpendicular to the force, the path followed by the object is a circular one. Hence the velocity of the object is perpendicular to the acceleration. 
 
        
             
        
        
        
Answer: Pedaling your bike : acceleration :: applying the brakes : inertia. 
The reason I think this to be the answer to the analogy is because there is energy and work used in both processes (and the unit focuses on forces); gravity is constant and does not change whether one pedals or applies brakes. And I do not think it's deceleration, as deceleration tends to equate to acceleration within the physics perspective. 
Edit: I should also add that since you clarified that your unit is motion and forces, Newtons 1st law is the law of inertia. The way to change an objects motion for it to slow down is by applying an additional force. That resistance the bike experiences to slow is the process of inertia. Inertia happens in order to accelerate an object (either by slowing it down, or speeding it up): i.e., the resistance to change.
 
        
             
        
        
        
Answer:
36 kg
Explanation:
To answer this question, a few assumptions have to be made:
- That the temperature on the day is 35 °C
- That all the heat from the elephant is goes to warming/evaporating the water on the surface of the elephant
Energy released per hour = 2500 J/s * 3600 s = 9 000 000 J
Q = mcΔT
9 000 000 J= m *4.186 J/g-K * (373K - 308K) + m*2260 J/g
m =  36 000 g = 36 kg