Shelley gives her little sister a 5-meter head start in a bike race. The race ends 15 meters east from where Shelley started. If her little sister completes the race in 5 seconds, what is her sister’s average velocity? (Round your answer to the nearest whole number.)

Shelley’s sister starts 5 meters east of Shelley’s starting point, while the finish is 15 meters east of that point. So her displacement is 15 − 5 = 10 meters east. Average velocity is displacement divided by time: 10 ÷ 5 = 2 m/s east, which is choice B.

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