Velocity is a vector quantity defined as the rate of change of displacement. Displacement is the net change in position from the starting point to the ending point, considering direction. The drone started at the warehouse and returned to the same warehouse. Therefore, the net displacement for the entire trip is zero. Average velocity = Total displacement / Total time = 0 km / 40 minutes = 0 km/h. Why others are wrong: A — B — This represents half of the average speed. C — This represents the drone's average *speed* for the entire trip (40 km total distance / (2/3) hour). D — This value is double the average speed, indicating a calculation error.

1. The scenario states the train is traveling at a "steady 200 km/h," which directly indicates that its speed (the magnitude of motion) is constant. 2. Velocity is a vector quantity, meaning it encompasses both magnitude (speed) and direction. 3. When the train "navigates a continuous curve," its direction of travel is continuously changing. 4. Therefore, even though the speed remains constant, the continuous change in direction means the train's velocity is continuously changing. Why others are wrong: A — Velocity is a vector quantity that includes direction; if the direction is changing, the velocity cannot be constant. B — The scenario explicitly states the train is at a "steady 200 km/h," indicating its speed is constant, not changing. D — The scenario explicitly states the train is at a "steady 200 km/h," indicating its speed is constant, not changing.

Speed is a scalar quantity, representing only the magnitude of motion. The scenario explicitly states the car maintains an instantaneous speed of 100 km/h, meaning its speed is constant. Velocity is a vector quantity, representing both the magnitude (speed) and the direction of motion. As the car moves around a circular track, its direction of travel is continuously changing. Since velocity is defined by both magnitude and direction, a continuous change in direction implies a continuous change in velocity, even if the speed remains constant. Why others are wrong: A — Velocity changes because the car's direction of motion is continuously altering. C — The car's speed is stated as unchanging (100 km/h). D — The car's speed is stated as unchanging (100 km/h).

1. Average speed is calculated by dividing the total distance traveled by the total time taken. 2. The total distance traveled is 100 km (north) + 100 km (south) = 200 km. 3. The total time taken for the journey is 2 hours + 2 hours = 4 hours. 4. Therefore, the average speed is 200 km / 4 hours = 50 km/h. 5. Average velocity is calculated by dividing the total displacement by the total time taken. 6. Displacement is the net change in position from the starting point to the ending point. 7. The car starts at a certain point, travels 100 km north, and then returns 100 km south, ending at its original starting position. 8. This means the total displacement of the car is 0 km. 9. Consequently, the average velocity is 0 km / 4 hours = 0 km/h. Why others are wrong: A — Incorrect, as the average speed is 50 km/h, not 0 km/h. B — Correct, as it accurately states the calculated average speed (50 km/h) and average velocity (0 km/h). C — Incorrect, as the average speed is 50 km/h (not 0 km/h) and the average velocity is 0 km/h (not 50 km/h). D — Incorrect, as the average velocity is 0 km/h, not 50 km/h.

Speed is a scalar quantity, representing only the magnitude of how fast an object is moving. Velocity is a vector quantity, which includes both magnitude (speed) and direction. In this scenario, the car maintains a steady speed of 200 km/h, meaning the magnitude of its motion is constant. However, because the car is moving on a circular track, its direction of travel is continuously changing. Therefore, while its speed is constant, its velocity (which includes direction) is constantly changing. Why others are wrong: A — This statement correctly distinguishes between constant speed and changing velocity due to directional change. B — Velocity cannot be constant because the car's direction is continuously changing as it moves in a circle. C — The scenario explicitly states the car maintains a "steady 200 km/h," indicating constant speed, not changing speed. D — The car's speed is stated as steady, so it is not constantly changing; only its velocity is changing due to direction.