We have: a = v/t
Here, t = 2 s  [ Given ]
a = 9.8 m/s²  [constant value for earth system ]
Substitute their values into the expression:
9.8 = v/2
v = 9.8 × 2
v = 19.6 m/s
In short, Your Answer would be Option B
Hope this helps!
        
                    
             
        
        
        
What happens to has when it cools is ... 
Step 1) They will start to form liquids, like condensation. 
Step 2) As liquids cool, they will turn into solids. 
Step 3) As solids cool, they become more stable and solid.
        
             
        
        
        
Depends on how well built he is probably for the average American 8 MPH