The radius vector of a material point relative to the origin changes with time according to the law: r = at ^ 2i- (y-bt ^ 2) j, where a, b, y are positive constants. Determine the distance traveled by the point in the first t seconds of movement.

Detailed solution with a brief record of the conditions, formulas and laws used in the decision, the conclusion of the calculation formula and the answer.
If you have any questions about the decision, write. I will try to help. File in image format.