The figures below show the motion of three different moving particles (Cars A, B, and C). Each dot represents the position of the car at successive 1-second time intervals. For example, for Car A, the dot labeled  t1  indicates its initial position while the  t2  dot shows the position 1 second later, the  t3  dot is one second after that, and so on. Which car has no unbalanced force acting on it?

Question
The figures below show the motion of three different moving particles (Cars A, B, and C). Each dot represents the position of the car at successive 1-second time intervals. For example, for Car A, the dot labeled 
t1
 indicates its initial position while the 
t2
 dot shows the position 1 second later, the 
t3
 dot is one second after that, and so on.
Which car has no unbalanced force acting on it?

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