Answer:
No. Water can be used in a hydroelectric dam to generate electricity, but this does not make us use more or less water in our homes.
Explanation:
 
        
                    
             
        
        
        
The correct answers would be B, and d
        
                    
             
        
        
        
I would rather be hit by the deflated ball because it wouldn't hurt as bad because it wouldn't have a lot of weight to hurt me in anyway
        
             
        
        
        
The final velocity of the train at the end of the given distance is 7.81 m/s.
The given parameters;
- initial velocity of the train, u = 6.4 m/s
- acceleration of the train, a = 0.1 m/s²
- distance traveled, s = 100 m
The final velocity of the train at the end of the given distance is calculated using the following kinematic equation;
v² = u² + 2as
v² = (6.4)² + (2 x 0.1 x 100)
v² = 60.96
v = √60.96
v = 7.81 m/s
Thus, the final velocity of the train at the end of the given distance is 7.81 m/s.
Learn more here:brainly.com/question/21180604
 
        
             
        
        
        
Answers:
a) 
b) 
c) 
Explanation:
<h3>a) Impulse delivered to the ball</h3>
According to the Impulse-Momentum theorem we have the following:
 (1)
 (1)
Where:
 is the impulse
 is the impulse
 is the change in momentum
 is the change in momentum
 is the final momentum of the ball with mass
 is the final momentum of the ball with mass  and final velocity (to the right)
 and final velocity (to the right) 
 is the initial momentum of the ball with initial velocity (to the left)
 is the initial momentum of the ball with initial velocity (to the left) 
So:
 (2)
 (2)
 (3)
 (3)
 (4)
 (4)
 (5)
 (5)
<h3>b) Time </h3>
This time can be calculated by the following equations, taking into account the ball undergoes a maximum compression of approximately  :
:
 (6)
 (6)
 (7)
 (7)
Where:
 is the acceleration
 is the acceleration
 is the length the ball was compressed
 is the length the ball was compressed
 is the time
 is the time
Finding  from (7):
 from (7):
 (8)
 (8)
 (9)
 (9)
 (10)
 (10)
Substituting (10) in (6):
 (11)
 (11)
Finding  :
:
 (12)
 (12)
<h3>c) Force applied to the ball by the bat </h3>
According to Newton's second law of motion, the force  is proportional to the variation of momentum
 is proportional to the variation of momentum   in time
 in time   :
:
  (13)
 (13)
  (14)
 (14)
Finally:
 