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State which of the following situations are possible and give an example for each of these:

(a) an object with a constant acceleration but with zero velocity

(b) an object moving in a certain direction with an acceleration in the perpendicular direction
(a) It is
 
(b) It is
 
Example:
 
(case - a)
(case - b)
Answer variants:
An object accelerating in a circular trajectory
An object thrown up into the air