Question

You are given a vector in the xy plane that has a magnitude of 70.0 units and a y component of –55.0 units what are the two possibilities for its x component?

Answer 1

Old vector is one given for the problem and new vector is one that adds to old one to get the final one.

New vector are cancelled as the old one's y component so that it y component are equal magnitude with 50 units and opposite directions are positive y direction.

There is no y component resulting vector x component are equal to length of vector.