Speed-time graph for train stopping briefly at station

Steps:

• Analyze motion phases: train decelerates to stop, remains stationary briefly, then accelerates away.
• Seek graph with decreasing speed to zero, short horizontal line at zero, then increasing speed.
• Eliminate graphs lacking brief zero-speed interval or showing unrealistic constant speed during stop.
• Confirm match with real-world train behavior at stations.

Why C is correct:

• Graph C shows deceleration to zero speed, a short constant zero interval (stationary phase per kinematics definition), and acceleration, matching the motion.

Why the others are wrong:

• A: No stop; speed remains constant or continuously changes without zero interval.
• B: Lacks flat zero section; implies no stationary time at station.
• D: Shows prolonged stop or no acceleration after; doesn't fit short stop scenario.

Final answer: C