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30 August, 08:46

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1. If you walk for 1.5 hours and travel 7.5 km, what is your average speed

2. A bird flies at a speed of 15 m/s for 10 s, 20 m/s for 10 s, and 25 m/s for 5 s. What is the birds average speed?

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  1. 30 August, 09:03
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    1. v=d/t=7.5/1.5=5 km/h

    2. v=d/t = (v1*t1+v2*t2+v3*t3) / (v1+v2+v3) = (15*10+20*10+25*5) / (10+10+5) =

    = (150+200+125) / 25=475/25=19 m/s
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