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The force of friction is equal to the product of the vertical force applied by the surface to the object in the coefficient of friction.
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In this question ,
 surface vertical force = Weight of the object
Thus ;
svf = ( mass ) × ( gravity acceleration ) 
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If gravity acceleration is 10 :
svf = 10 × 10 = 100 N 
So ;
frictional force = 100 × 0.20 
frictional force = 20 N 
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If gravity acceleration is 9.8 : 
svf = 10 × 9.8 = 98 N
So ; 
frictional force = 98 × 0.20 
frictional force = 19.6 N 
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The correct answer to the question is : Transverse wave.
EXPLANATION :
Before going to answer this question, first we have to understand the longitudinal and transverse wave.
LONGITUDINAL WAVE : A longitudinal wave is a mechanical wave in which the direction of vibration of particles is parallel to the direction of wave propagation. It moves in the form of compression and rarefaction.
For instance, sound wave.
TRANSVERSE WAVE : A transverse wave is a mechanical wave in which the direction of vibration of particles is perpendicular to the direction of wave propagation. It moves in the form of crests and troughs.
For instance, the wave created in a pond when a stone is dropped into it.
Hence, the correct answer of this question is transverse wave.
 
        
                    
             
        
        
        
Make sure the triple beam balance is at 0 before you begin.
        
                    
             
        
        
        
The density of ice is less than the density of water. C