Question

Which of the following is not vector quantity?
A. Retardation
B. Acceleration due to gravity
C. Average speed
D. Displacement

Answer 1

Hint: Scalar quantity which has only magnitude vector quantity which has both magnitude and direction.

Complete step by step solution:
Let us consider each of the following options,
1. Retardation: It is having both magnitude and direction. The direction which is opposite to the Acceleration.

2. Acceleration due to gravity: It has both magnitude and direction. The direction which is downwards or towards earth.

3. Average Speed: Speed is a scalar quantity which has only magnitude. Therefore, Average speed has only magnitude.

4. Displacement: It has both magnitude and direction. The direction which is the shortest distance.

Hence, Average speed is not a vector quantity.

Note: This is true for all the situations and conditions. It is characterized by the presence of both magnitude and number.