Question

For a particle moving along a straight line, match the left column entries with the entries of right column.

Column 1	Column 2
Distance	Can decrease with time
Average speed	Can increase with time
Average velocity	Can be zero
Magnitude of displacement	can be zero

Answer 1

Part A:

1. Distance can increase with time or can be zero.
2. Distance is a scalar quantity it has magnitude only, so it can increase with time.
3. Distance can be zero when the object is at rest.

Thus, A-II, III, IV

Part B:

1. Average speed can decrease with time, can increase with time, or can be zero.
2. Average speed can increase with time because it does not indicate direction.
3. Average speed can decrease by applying acceleration opposite direction to the motion.
4. Average speed can be zero when the object is at rest.

Thus, B - I, II, III, IV

Part C:

1. Average velocity can decrease with time, can increase with time or can be zero.
2. Average velocity is a vector quantity it has magnitude and direction so it can increase, decrease, and can be zero with time.

Thus, C - I, II, III, IV

Part D:

1. The magnitude of displacement can decrease with time, can increase with time or can be zero
2. When the body moves towards the initial position magnitude of displacement decreases.
3. If the initial and final position coincides then the magnitude of displacement can be zero.
4. When the body moves away the initial position magnitude of displacement increase with time.

Thus, D - I, II, III, IV

Left column	Right Column
Distance	Can increase with time, Can be zero
Average speed	Can decrease with time, Can increase with time, Can be zero
Average velocity	Can decrease with time, Can increase with time, Can be zero
Magnitude of displacement	Can decrease with time, Can increase with time, Can be zero