A student throws a rock horizontally from the edge of a cliff that is 20 m high. The rock has an initial speed of 10 m/s. If air  resistance is negligible, the distance from the edge of the base of the cliff to where the rock hits the level ground below the cliff is most nearly
       
      
                
     
    
    
    
    1  answer:
            
              
Answer: 
option A 
Explanation: 
given,
height of the cliff = 20 m
initial speed = 10 m/s
distance from the edge of the base of the cliff  = ?
now,
time taken to cover vertical distance 
initial vertical speed = 0 m/s
using equation of motion
   t = 2 s
in same time the ball will travel horizontal distance
horizontal velocity of ball = 10 m/s
distance = s x t
 d = 10 x 2
 d = 20 m 
Hence, the correct answer is option A 
 
                                
             
         	
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