Question #ceaab

1 Answer
Feb 28, 2017

Answer:

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"#