Constant velocity yields linear distance-time graph

Steps:

• Fan applies steady force to air bubble, producing constant velocity after initial motion.
• Distances recorded at equal 1-minute intervals for 10 minutes.
• Plot distance (y-axis) versus time (x-axis) from data points.
• Linear trend emerges as distance proportional to time at constant speed.

Why B is correct:

• B depicts straight line from origin, matching s = vt formula for uniform motion.

Why the others are wrong:

• A shows upward curve, implying acceleration not present with steady fan.
• C shows downward curve or plateau, suggesting deceleration absent here.
• D shows horizontal line, indicating no motion despite fan activation.

Final answer: B