Final Answer:
1. The slope tells you the runner’s speed (distance per second).
2. Bob completed the 100 m race in the least time: 14 seconds.
3. Charlie started out the fastest.
4. Between 8 s and 10.5 s, Charlie was stationary (not moving).
5. A straight line means constant speed; a curved line means changing speed (accelerating or decelerating).
6. Albert overtook Bob at 60 meters, at 10 seconds.
7. Total displacement for all three runners: 0 meters (they all ended at the start/finish line — 100 m from start, but displacement is final position minus initial position; if they finished at the same point they started, Δd = 0 — however, based on Graph 1, all three reach 100 m and stop there, so displacement = +100 m each. Since the question asks for *total* displacement of all three, it's 100 + 100 + 100 =
300 meters.)
Wait — rechecking: In a 100 m race, runners start at 0 m and finish at 100 m. Displacement = final position − initial position = 100 − 0 = 100 m per runner. So total displacement of all three = 3 × 100 =
300 meters.
But note: sometimes “displacement” is asked per person, not summed. However, Q7 says “total displacement of all three runners (Δd)”, implying sum. So:
300 meters
Parent Tip: Review the logic above to help your child master the concept of interpreting motion graphs worksheet.
