Chapter 2.1 Review

A girl rides her bike with an average velocity of 15.2 km/h northward. If it takes her 25 min to ride to her friend’s house, what is her displacement?

• 1.6 km

• 3.8 km

• 6.3 km

• 7.6 km

• 380 km

A man hikes 6.6 km north along a straight path with an average velocity of 4.2 km/h to the north. He rests at a bench for 15 min. Then, he hikes 3.8 km north with an average velocity of 5.1 km/h to the north. How long does the total hike last?

• 1.1 h

• 2.0 h

• 2.2 h

• 2.3 h

• 2.6 h

During which of the following time periods did the object travel at a constant velocity?

• 0–5 s

• 0–15 s

• 15–20 s

• 20–25 s

• 20–30 s

At which time did the object experience a positive acceleration?

• 5 s

• 15 s

• 15.5 s

• 22.5 s

• 25 s

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With an average acceleration of 1.5 m/s², how long will it take a driver to accelerate from a complete stop to 25 km/h?

• 3.6 s

• 4.6 s

• 17 s

• 60 s

• 280 s

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A cheetah runs at a steady velocity of 60 km/h (16.7 m/s). Over a period of 5.0 s, the cheetah increases its pace to 95 km/h (26.4 m/s). What is the average acceleration of the cheetah over this period?

• 1.9 m/s²

• 3.5 m/s²

• 7.0 m/s²

• 9.7 m/s²

• 48 m/s²

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An elevator accelerates uniformly from rest to a speed of 2.5 m/s in 12 s. What is the distance the elevator travels during this time?

• 1.3 m

• 4.8 m

• 14 m

• 15 m

• 30 m

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What is the feather’s average acceleration during the first 2 s?

• 4.9 m/s²

• 9.8 m/s²

• 14.7 m/s²

• 19.6 m/s²

• 39.2 m/s²

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If the feather continued to fall at this same acceleration, what would its velocity be after 20 s?

• 2 m/s

• 20 m/s

• 200 m/s

• 2,000 m/s

• 20,000 m/s

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A boat with an initial speed of 5.0 m/s accelerates at a uniform rate of 1.2 m/s² for 5.0 s. What is the final speed of the boat during this time?

• 6.0 m/s

• 6.2 m/s

• 11 m/s

• 26 m/s

• 31 m/s

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