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Posted by on Thursday, October 4, 2012 at 12:40pm.

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 - , Friday, October 5, 2012 at 4:30pm

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

  • physics - , Saturday, October 12, 2013 at 10:58pm

    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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