Question

Which of the following is not a vector?

• A. Speed
• B. Velocity
• C. Displacement
• D. Acceleration

Answer 1

The correct option is A

Speed

Explanation for the correct option:

(A): Speed

Definition:

Speed is defined as the distance travelled by an object at a given time. Since distance and time are scalar quantities as they have only magnitude thus speed is also a scalar quantity.

Explanation for the incorrect option(s):

(B) Velocity (C) Displacement are both vectors as they have both magnitude and direction.

(D) Acceleration is defined as the change in velocity with respect to time. Since velocity is a vector quantity. Hence, acceleration is also a vector.