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You drive a car 2.0 km to the gas station, 4.0 km to the shopping mall to let your mother off, and 4.5 km back home. The trip takes 20.0 min. What is your average speed?

  • physics - ,

    r = d/t = (2+4+4.5)/(20/60)h = 31.5km/h.

  • physics - ,

    Henry almost had it right....

    s=(2+4+4.5)km/ 20min --> convert to m/s: s=10.5km/20min x 1000m/1km x 1min/60s --> 8.75 m/s

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