To specify an object's velocity completely, one needs to specify its
A) direction of travel.
B) speed.
C) rate of change of acceleration.
D) speed and direction of travel.

Question

Quizplus · Accepted Answer

Velocity is a vector quantity that includes both speed (how fast an object is moving) and direction of travel. Therefore, to completely specify an object's velocity, both its speed and direction of travel must be known.

To Specify an Object's Velocity Completely, One Needs to Specify