1.Synovial joint
2. pivot joint
3. Hinge joint
<span>This apparent measurement difference is due to a change in position of the observer, and is called "Parallax"
In short, Your Answer would be Option C
Hope this helps!</span>
To solve this problem, it is necessary to apply the concepts related to speed of light and the kinematic equations of speed description.
The speed by definition can be expressed as the path of a particle during a certain time, in our case,
Where,
d= distance
v = speed
c = Speed of light 
Replacing to find the time we have,
Therefore the time is 
This movement of the coin relative to the knee is not under an inertial frame, because knee is accelerated relative to the coin.
a) coin acceleration relative to the ground: g = 9.81 m/s^2. This is the acceleration due to the atraction of the earth, given that the coin is not tied to the car or to the knee.
b) coin acceleration relative to the knee: acceleration of the coin relative to the ground - acceleration of the knee relative to the ground = - g - (-1.24g) = 0.24 g = 0.24 * 9.81 m^2^2 = 2.354 m/s^2
c) time to the coin move 2.2 m upward, relative to the car
d = a*t^2 / 2 , where a is the acceleration relative to the car (same of the knee)
=> t = √(2d/a) = √(2*2.2m/2.354 m/s^2) = 1.37 s
d) actual force on the coin
Use the acceleration relative to the ground, a=g = 9.81 m/s^2
F = m*a = 0.567 g * 10^-3 kg/g * 9.81 m/s^2 = 5.56*10^-3 N
e) apparent force
Use apparent acceleration, a = 2.354 m/s^2
F = m*a = 0.567*10^-3 kg * 2.354 m/s^2 = 1.33*10^-3 N
