Find the cases
No work is done by a force on an object if (1) the object is stationary but the point of application of the force moves on the object (2) the object moves in such a way that the point of application of the force remains fixed (3) the force is always perpendicular to its velocity (4) the force is always perpendicular to its acceleration. Write your answer as an integer with digits in increasing order, e.g. if all are correct then write 1234, if (1) and (2) are correct then write 12.
The answer is 134.
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