A reference point would be something not on the ship which could be used to calculate distance traveled.
Answer: C.) A lighthouse on a nearby Island
 
        
                    
             
        
        
        
Answer:
B. 6 cm
Explanation:
First, we calculate the spring constant of a single spring:

where,
k = spring constant of single spring = ?
F = Force Applied = 10 N
Δx = extension = 4 cm = 0.04 m
Therefore,

Now, the equivalent resistance of two springs connected in parallel, as shown in the diagram, will be:

For a load of 30 N, applying Hooke's Law:

Hence, the correct option is:
<u>B. 6 cm</u>
 
        
             
        
        
        
Answer:17.08 s
Explanation:
Given
distance between First and second Runner is 45.6 m
speed of first runner =3.1 m/s
=3.1 m/s
speed of second runner =4.65 m/s
=4.65 m/s
Distance between first runner and finish line is 250 m 
Second runner need to run a distance of 250+45.6=295.6 m
Time required by second runner 
time required by first runner to reach finish line
Thus second runner reach the finish line 80.64-63.56=17.08 s earlier
 
        
             
        
        
        
It would be oraganic matter I think.