In which of the following cases of motions, the distance moved and the displacement is same?
a) If the car is moving on a straight road
b) If the car is moving in circular path
c) The pendulum is moving to and fro
d) The earth is revolving around the sun
If the car is moving on a straight road, the direction of the motion does not change. Hence the distance moved and the displacement is the same.
In the other cases, magnitude of distance and displacement is not the same.