A girl swims ten lengths of a 25 m pool. Which one or more of the following statements correctly describes her distance travelled and displacement?

A girl swims ten lengths of a 25 m pool. Which one or more of the following statements correctly describes her distance travelled and displacement?

• Her distance travelled is zero.
• Her displacement is zero.
• Her distance travelled is 250 m.
• Her displacement is 250 m.

During a training ride, a cyclist rides 50 km north then 30 km south.

• What is the distance travelled by the cyclist during the ride?
• What is the displacement of the cyclist for this ride?
• A lift in a city building, shown in the figure, carries a passenger from the ground floor down to the basement, then up to the top floor.

• What is the displacement of the lift as it travels from the ground floor to the basement?
• What is the displacement of the lift as it travels from the basement to the top floor?
• What is the distance travelled by the lift during this entire trip?
• What is the displacement of the lift during this entire trip?

1. A cyclist travels 25 km in 90 minutes.
2. What is her average speed in ?
3. What is her average speed in ?

1. Liam pushes his toy truck 5 m east, then stops it and pushes it 4 m west. The entire motion takes 10 seconds.
2. What is the truck’s average speed?
3. What is the truck’s average velocity?

1. An athlete in training for a marathon runs 10 km north along a straight road before realising that she has dropped her drink bottle. She turns around and runs back 3 km to find her bottle, then resumes running in the original direction. After running for 1.5 h, the athlete reaches 15 km from her starting position and stops.
2. What is the distance travelled by the athlete during the run?
3. What is the athlete’s displacement during the run?
4. What is the average speed of the athlete in ?
5. What is the athlete’s average velocity in ?

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