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  • marianne aamodt

    Member
    July 28, 2020 at 4:11 pm

    A human walks at about 5 km/h. What is this speed in metres per second?

    5 km = 5000 m 1 hour = 3600 sec

    The ratio is 5000:3600 Divide each by 100

    50:36 Divide each by half

    25:18

    Constant of proportionality is:

    The speed is 25/18ths metres per second

    Wow. I think I am beginning to “get it”!

    It feels weird to think in terms of fractions instead of decimals. We are so used to using calculators. I think it is going to be a challenge to get kids used to NOT using them ALL THE TIME!