Question

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a train leaves a station, starting from rest, at time t = 0.0 s. at time t = 3600.0 s, the train is traveling due west at 28 m/s. in this example, the 28 m/s is the trains
average acceleration
instantaneous velocity
average velocity
instantaneous acceleration
average speed

Explanation:

• Average acceleration: Rate of velocity change over time (not just velocity value).
• Instantaneous velocity: Velocity at a specific instant (here, \( t = 3600.0\,\text{s} \), with direction (west), so this matches.
• Average velocity: Total displacement over total time (not just a single - time velocity).
• Instantaneous acceleration: Rate of acceleration change at an instant (not velocity).
• Average speed: Total distance over total time (scalar, no direction, but here we have direction (west) and a specific - time velocity).

Answer:

B. instantaneous velocity