Question

1.Find the average speed of a bicycle if it completes two round of a circular track of radius 140m twice in 5min 52 sec.
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Answer 1

Answer:

2.5 m/s

Explanation:

Circumference of track (distance)

= 2 × pi × r

$= 2 \times \frac{22}{7} \times 140$

= 880 m

Time = 5 min 52 sec

= (60×5) + 52 sec

= 300 + 52 sec

= 352 sec

:. speed

$= \frac{distance}{time}$

$= \frac{880}{352}$

$= 2.5 \: {ms}^{ - 1}$