Answer: 10.36m/s
How? Just divide 200m by 19.3 and you will get how fast he ran per m/s
        
             
        
        
        
The other person who answered this is wrong btw
        
             
        
        
        
Answer:
Althought it us possible to have more then one state, it's also possible to have only one state of matter
Explanation:
You can make solutions of only one state if matter, for example , it two liquids can be mixed to form a solution they are called miscible.
 
        
             
        
        
        
Answer:
Explanation:
Electric field between plates of a parallel plate capacitor is uniform . 
In a uniform electric field , relation between electric field and potential gradient is as follows 
electric field = potential gradient               [ E = - dV / dl ] 
in the given case , 
dV = 51 V  , 
 dl = 4 cm
 =  4 x 10⁻² m 
E = 51 /  4 x 10⁻² 
= 12.75 x 10² V / m 
= 1275 V / m