Complete Question
While john is traveling along a straight in interstate highway, he notices that the mile marker reads 242 km. John travels until he reaches the 147 km marker and then retraces his path to the 161 km marker. What is John's resultant displacement from the 242 km marker? How far has he traveled answer in units of km
Answer:
The resultant displacement 
The total distance traveled by john is
Explanation:
From the question we are told that
The first position of john from the finish point is 
The second position of john from the finish point is 
The third position of john from the finish point is 
Generally the displacement from the 242 km marker is mathematically represented as

Here we used
instead of
because
is further than
from the finish point
=> 
Generally the total distance traveled by John is mathematically evaluated as
=>
=>
When the mass of 2.0 kg is attached to the spring, the force applied to the spring is the weight of the mass, so

This force stretches the spring by

, so we can use Hook's law to find the spring constant:

Then the mass of 2.0 kg is removed and replaced with another mass m2=2.7 kg. The force produced by this mass is equal to its weight:

And so, we can use again Hook's law to calculate the new stretch of the spring:
The answer is D. All of the above
When we draw a graph, we represent the Dependent Variable on the Y-axis and the Independent Variable on the X-axis. The graph is then named in the format "Y-variable vs X-variable". In this case Y-variable = mpg and X-variable = speed of car.
Independent Variable simply means that we can freely change that variable and observe how the Dependent Variable changes. So, here the speed of the car is being changed on a straight flat road and its effect on mpg is being studied.