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14 October, 06:46

a bird flies at a speed of 15 m/s for 10s, 20 m/s for 20s, and 30 m/s for 15s. what is the birds average speed

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  1. 14 October, 07:40
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    Average speed = (total distance) / (total time)

    First segment:

    15 m/s for 10 sec; distance covered = (15 x 10) = 150 m

    Second segment:

    20 m/s for 20 sec; distance covered = (20 x 20) = 400 m

    Third segment:

    30 m/s for 15 sec; distrance covered = (30 x 15) = 450 m

    Total time = (10s + 20s + 15s) = 45 sec

    Total distance = (150m + 400m + 450m) = 1,000 m (1 km)

    Average speed = (1,000 m) / (45 sec) = 22.22 m/s
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