Going round in circles!
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motion of a simple pendulum
A mini bus traveled 60 kph when it will
Traffic lights sequence during rush hour traffic!
You do not. You see it stereoscopically, but the brain compares the images with experience and assumes threedimensional interpretations. This can be used to fool people with optical illusions. Forms that are possible in a twodimensional world, but does not have a representation in 3D that makes sense.
A problem in motion along a straight line is a problem that takes place in one dimension. An example problem is an object on a straight conveyor belt.