Question #ceaab

1 Answer
Eddie
Feb 28, 2017

Average velocity for trip: approx 71 "km/hr"

Explanation:

A car moves due east at 93 km/hr for 64 minutes and then turns around and moves west at 72 km/hr for 10 minutes, what is the average velocity for the entire trip?

  • Distance travelled in E direction:

93*64/60 km

  • Distance travelled back in W direction:

72*10/60 km

Net travel ( ie displacement ) in E direction is:

93*64/60 - 72*10/60 km

=436/5 km = 87.2 km

Time for entire trip: 64 + 10 = 74min = 74/60 hr

Average velocity for trip = "displacement"/"time"

= 87.2/(74/60) approx 70.702 "km/hr"

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