Question

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.)

1 m/s east
2 m/s east
3 m/s east
4 m/s east

Answer 1

Her sister starts 5 m east of Shelley (x0 = +5 m) and finishes at +15 m, so displacement = 15 − 5 = 10 m east. Average velocity = displacement / time = 10 m / 5 s = 2 m/s east.