Question

Which of the following distinguishes the speed of an object from the velocity?

Calculating speed requires knowing distance; calculating velocity does not require knowing distance.

Velocity includes the direction of the motion of an object; speed does not include direction.

Speed includes the time it took the object to travel; velocity does not include travel time.

Speed includes the direction of the motion of an object; velocity does not include direction of motion.

Answer 1

Answer : The correct option is, Velocity includes the direction of the motion of an object; speed does not include direction.

Explanation :

Speed : It is defined as the distance traveled by the object per unit time.

It is a scalar quantity because it does not depends on the direction of an object but it depends on the magnitude of the object. The unit of speed is, meter/second or m/s.

For example : The speed is written as, 50 m/s.

Velocity : It is defined a the displacement of an object with respect to the time.

It is a vector quantity because it depends on both direction and as well as on magnitude of the object. The unit of velocity is, meter/second or m/s.

For example : The velocity is written as, 50 m/s north.

Hence, the correct option is, Velocity includes the direction of the motion of an object; speed does not include direction.