Física Grados 7–9

Gr9-W8-L1

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Which of the following statements correctly distinguishes between speed and velocity?

A Speed and velocity are both vector quantities.

B Speed is a vector quantity, while velocity is a scalar quantity.

C Speed and velocity are both scalar quantities.

D Speed is a scalar quantity, while velocity is a vector quantity.

A student walks 100 meters north in 50 seconds, then turns around and walks 100 meters south in another 50 seconds. What is the student's average speed and average velocity for the entire trip?

A Average speed = 0 m/s, average velocity = 0 m/s

B Average speed = 2 m/s, average velocity = 2 m/s south

C Average speed = 2 m/s, average velocity = 2 m/s north

D Average speed = 2 m/s, average velocity = 0 m/s

A car travels 150 kilometers east in 3 hours. What is its average velocity?

A 50 km/h

B 450 km/h east

C 50 km/h east

D 0 km/h

During a round trip, a runner's average speed is 8 m/s and their average velocity is 0 m/s. Which statement best explains this?

A The runner ran at a constant speed of 8 m/s and returned to the starting point.

B The runner's velocity was constant throughout the trip.

C The runner did not move at all during the trip.

D The runner's total displacement is zero because they returned to the starting point, but total distance covered is not zero.

A cyclist moves 20 meters west in 4 seconds, then 30 meters east in 6 seconds. What is the cyclist's average velocity for the entire trip? (Take east as positive.)

A 5 m/s east

B 1 m/s west

C 5 m/s west

D 1 m/s east

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