I think 36m/12s because 3×12 =36
        
             
        
        
        
Answer:
hydrogen
helium
oxygen
Explanation:
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Answer:
The spring force constant is   .
 .
Explanation:
We are told the mass of the ball is  , the height above the spring where the ball is dropped is
, the height above the spring where the ball is dropped is  ,  the length the ball compresses the spring is
,  the length the ball compresses the spring is  and the acceleration of gravity is
 and the acceleration of gravity is  .
 .
We will consider the initial moment to be when the ball is dropped and the final moment to be when the ball stops, compressing the spring. We supose that there is no friction so the initial mechanical energy  is equal to the final mechanical energy
 is equal to the final mechanical energy  :
 :
                                                     
Initially there is only gravitational potential energy because the force of the spring isn't present and the speed is zero. In the final moment there is only elastic potential energy because the height is zero and the ball has stopped. So we have that:
                                                    
If we manipulate the equation we have that:
                                                     
                                          
                                               
                                                      
                                                    
                               
 
        
             
        
        
        
Answer:
false : In distance time graph,time is shown on the x -axis