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how and when we will use i,j,k unit vector in 2d, and 3d
if there are only 2 unit vectors then it is a 2d problem. if all three are present then it is 3d problem... solve all dimensions differently for example if it is 5i+4j position and the force applied is 10i+10j+10k then also object will move in 2d because j is not present in position vector and hence we will solve x direction and y direction separately using formula.. like if answer is good...
if there are only 2 unit vectors then it is a 2d problem.
if all three are present then it is 3d problem...
solve all dimensions differently
for example if it is 5i+4j position and the force applied is 10i+10j+10k then also object will move in 2d because j is not present in position vector and hence we will solve x direction and y direction separately using formula..
like if answer is good...
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