The slope of a speed-time graph is the acceleration represented by the graph.
All other parts of this question refer to a lab experiment or exercise 
where I was not present, but Zeesam16 was.  Therefore I have no data 
with which to answer the rest of the question, and hope that Zeesam can 
handle it.
        
             
        
        
        
Answer:
The mass number 204 – 82 protons = 122 neutrons
Explanation:
Hope this helps!
 
        
             
        
        
        
Answer:
- 0.328J
Explanation:
POTENTIAL ENERGY = mgh 
                                    = 0.00274 × 9.81×12.2  here 2.74g = 0.00274kg
                                    = 0.32792868 J 
                                    = 0.328J
AS IT IS BELOW THE SURFACE HENCE MUST BE NEGATIVE 
hence potential energy = - 0.328J
 
        
             
        
        
        
<span>a. current will increase.       </span>