Hector went to the music store by heading due south at 3 m/s, then turning West and continuing at the same speed for another three blocks. Which of the following is true about Hector's velocity?

Question

Hector's velocity changed because his direction changed.
Hector's velocity changed because his direction changed.

Hector's velocity did not change because his direction did not change.
Hector's velocity did not change because his direction did not change.

Hector's velocity changed because his speed changed.
Hector's velocity changed because his speed changed.

Hector's velocity did not change because his speed did not change.

Answer 1

The correct statement regarding Hector's velocity is:

Hector's velocity changed because his direction changed.

Velocity is a vector quantity, which means it has both magnitude (speed) and direction. Although Hector maintained a constant speed of 3 m/s, he changed direction from due south to due west, which means his velocity has changed.