Answer:
Fighting
Explanation:
Fighting with someone like punch for punch can make the person bleed which an injury to the guy who you fought with and you can be arrested if the parents file a complain at the police station
 
        
                    
             
        
        
        
Answer:
Part 1) Time of travel equals 61 seconds
Part 2) Maximum speed equals 39.66 m/s.
Explanation:
The final speed of the train when it completes half of it's journey is given by third equation of kinematics as

where
'v' is the final speed
'u' is initial speed 
'a' is acceleration of the body
's' is the distance covered 
Applying the given values we get

 Now the time taken to attain the above velocity can be calculated by the first equation of kinematics as 

Since the deceleration is same as acceleration hence the time to stop in the same distance shall be equal to the time taken to accelerate the first half of distance
Thus total time of journey equals
Part b) 
the maximum speed is reached at the point when the train ends it's acceleration thus the maximum speed reached by the train equals 
 
        
             
        
        
        
      Using the Universal Gratitation Law, we have:
 
      Again applying the formula in the new situation, comes:
 Number 4
Number 4If you notice any mistake in my english, please let me know, because i am not native.
 
        
        
        
Answer:
I don't understand please interpret
 
        
             
        
        
        
Answer:
The magnitude of the tension in he string is equal to the magnitude of the weight of the object.
Explanation:
According to the Newton's 1st law, An object will remain at rest or in uniform motion in a straight line unless acted upon by an unbalanced force.
In here, the elevator is moving with a constant speed. So the object must have the equal constant speed. Which means, it has a uniform motion. According to Newton's 1st law, the total unbalanced force on the object must be zero . As we know, there are only two forces are on the object and they are,
The tension in string(T)   ,   The weight of the object(W) .
                                   ∴ F    =   0
                                  T  -  W  =   0
So to balanced those forces, the magnitude of the tension in the string must be equal to the magnitude of the weight of  the object.