Answer:
1.5 kgms⁻¹
Explanation:
Momentum can be defined as "<em>mass in motion</em>."  
The amount of momentum that an object has is dependent upon two factors
- mass of the moving object  
when there is a change in the velocity , it creates a change in momentum also
when we consider that we can mathematically show this,In terms of an equation, 
Change in momentum    (ΔΡ) = m(Δv)
where (Δv) - change in velocity 
<em>(Δv) = final velocity - initial velocity</em> 
Change in momentum (ΔΡ) = m(Δv)
                                              = 0.1×([55-40]) 
                                              = 1.5 kgms⁻¹
       
 
        
             
        
        
        
The answer to this question is a) sulfur
        
                    
             
        
        
        
Answer:
When the object is placed at the focus the image is formed at infinity.
Explanation:
When a ray passes through focus and incident on a concave mirror then it will travel parallel to principal axis after reflection.Hence the image is formed at infinity.