Question

Match the items of Column A with the corresponding items of Column B.

Column 1	Column 2
speed	radian per second
displacement	radian
retardation	meter
angular velocity	meter per second
angular displacement	meter per (second)2

Answer 1

Part A

1. Speed is the rate at which a moving body covers distance.
2. It is a scalar quantity.
3. Its SI unit is meters per second (m/s).

Thus, (A) - (IV)

Part B

1. Displacement is the measure of a body's initial and final position.
2. It is a vector quantity which means it is described using both magnitude and direction.
3. Displacement's SI unit is a meter (m).

Thus, (B) - (III)

Part C

1. Retardation or negative acceleration is the acceleration of an object when the final velocity of the object is less than the initial velocity of an object.
2. Its SI unit is the same as acceleration, i.e., meters per second square (m/s²).

Thus, (C) - (V)

Part D

1. Angular velocity is the rate of change of angular displacement of a body which rotates or revolves around a point.
2. Its SI unit is radians per second (rad/s).

Thus, (D) - (I)

Part E

1. Displacement during an angular motion is known as angular displacement.
2. As it is measured in angle, its SI unit is the radian.

Thus, (E) - (II)

Hence, the correct answer is A-IV, B-III, C-V, D-I, E-II.