Answer:
20 m/s
Explanation:
Height (s)= 20m
acceleration (a) = 10 m/s^2
v=?
 
we know, 
 V^2= U^2 + 2as. (U is initial velocity)
or,. V^2 = 0 + 2 × 10 × 20
or, V^2 = 400
or,. V = 20 m/s
 
        
                    
             
        
        
        
Answer:
charge will be equal to  
   
Explanation:
We have given mass of the particle m = 1.45 gram = 0.00145 kg 
Acceleration due to gravity 
Electric field E = 700 N/C
Electric force will be equal to  , here q is charge and E is electric field
, here q is charge and E is electric field 
For particle to be stationary this force must be equal to force due to gravity , that is mg force 
So qE = mg 

So charge will be equal to  
 
 
        
             
        
        
        
Answer:
6 Minutes 40 Seconds or 400 Seconds
Explanation:
Time to cover a distance of 5m = 1 Second
Time to cover a distance of 2000m = 2000÷5
= 400 Seconds
After converting 400 Seconds into minutes it will become 6 minutes 40 seconds.
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