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    sgm1996's Avatar
    sgm1996 Posts: 19, Reputation: 1
    New Member
    		  
    #1

    Oct 1, 2012, 05:43 PM
    Physics average speed
    A reconnaissance plane flies 589 km away from
    Its base at 764 m/s, then flies back to its base
    At 1146 m/s.
    What is its average speed?
    Answer in units of m/s
    Abhimanyu Pudi's Avatar
    Abhimanyu Pudi Posts: 77, Reputation: 4
    Junior Member
    		  
    #2

    Oct 2, 2012, 01:01 AM
    Speed is a scalar. So, it depends on distance.

    Average speed = Distance traveled / time taken

    For its journey away from its base, the time taken by the plane = 589000 / 764 =770.94 s
    For its journey back to base, time taken = 589000 / 1146 = 513.96 s
    Total time of ride = 770.94 + 513.96 = 1284.90 s

    Total distance traveled = 589 km + 589 km = 1178 km = 1178000 m

    Therefore, average speed = 1178000 / 1284.90 = 916.80 m/s
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