Choose the correct statement.

Options

A. The magnitudes of speed and velocity are the same when a body travels in a straight line path.
B. The average speed of a moving body can be equal to zero, but its average velocity cannot be equal to zero.
C. To describe the velocity, direction is necessary.
D. Both (a) and ( c)

Answer

D

Explanation

(1) When a body travels in a straight line path, its distance and displacement are equal, and hence, in a given time, its velocity is equal to its speed.
(2) The average velocity of a body may be equal to zero if the total displacement of the body is equal to zero, but the average speed will not be equal to zero unless and until the distance covered is zero (i.e., the body is at rest).
(3) To describe velocity, direction is necessary as velocity is speed in a specific direction.