I attached the missing picture.
We can figure this one out using the law of conservation of energy.
At point A the car would have potential energy and kinetic energy.

Then, while the car is traveling down the track it loses some of its initial energy due to friction:

So, we know that the car is approaching the point B with the following amount of energy:

The law of conservation of energy tells us that this energy must the same as the energy at point B.
The energy at point B is the sum of car's kinetic and potential energy:

As said before this energy must be the same as the energy of a car approaching the loop:

Now we solve the equation for

:
The doctor's average speed for the whole trip is 75 km per hour. His average velocity for the whole trip is zero.
Electric motors require electricity to move the motor parts and do work (like an electric fan).
Elecgric generators actually burn diesel fuel to spin a motor around and around and around to GENERATE, or MAKE, electricity that you can then use to power your fans and lights in your house.
Given:
m = 1160 kg
g = 9,81 m/s²
v = 2.5 m/s
Unknown:
k spring constant
x spring compression
1. equation to use is Newton's 2nd law and Hook's law:

2. equation to use, the energy of the spring must equal the energy of the satellite:

Combinig the two equations: