1) Focal length
We can find the focal length of the mirror by using the mirror equation:

 (1)
where 
f is the focal length

 is the distance of the object from the mirror

 is the distance of the image from the mirror
In this case, 

, while 

 (the distance of the image should be taken as negative, because the image is to the right (behind) of the mirror, so it is virtual). If we use these data inside (1), we find the focal length of the mirror:

from which we find

2) The mirror is convex: in fact, for the sign convention, a concave mirror has positive focal length while a convex mirror has negative focal length. In this case, the focal length is negative, so the mirror is convex.
3) The image is virtual, because it is behind the mirror and in fact we have taken its distance from the mirror as negative.
4) The radius of curvature of a mirror is twice its focal length, so for the mirror in our problem the radius of curvature is:
 
 
        
        
        
I would say b as well. I’m sorry if it’s wrong
        
             
        
        
        
Answer:
The horizontal velocity is 
Explanation:
From the question we are told that 
      The mass of the pumpkin is  
       The distance of the the car from the building's base is  
        The height of the roof is 
         
The height is mathematically represented as 
          
Where g is the acceleration due to gravity which has a value of 
substituting values 
           
making the time taken the subject of the formula 
          
           
The speed at which the pumpkin move horizontally can be represented mathematically  as 
                          
substituting values 
                      
                      
 
        
             
        
        
        
True. It would be false if the statement was "trunk rotation is the most common <em>static</em> flexibility assessment."
So, you're answer should be "true". Hope that helped!