Expand each vector into their component forms:

Similarly,


Then assuming the resultant vector  is the sum of these three vectors, we have
 is the sum of these three vectors, we have


and so  has magnitude
 has magnitude

and direction  such that
 such that

 
        
             
        
        
        
A. The cliff was 30.7 m high
B. I also got 9.5 as the horizontal distance 
Here is my work, I find making charts like this one to find knowns and unknowns can be helpful
 
        
        
        
The answer is B tell me if I am wrong.
        
             
        
        
        
Answer:
B. Same for a chemical family 
 
        
             
        
        
        
In this item, we are asked to determine the speed of the bobsled given the distance traveled and the time it takes to cover the certain distance. This can mathematically be expressed as,
                          speed = distance / time
Substituting the given values in this item,
                         speed = (113 m) / (29 s)
                         speed = 3.90 m/s
<em>ANSWER: 3.90 m/s</em>