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    sabona's Avatar
    sabona Posts: 2, Reputation: 1
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    #1

    Sep 13, 2011, 11:01 PM
    Help with physics homework
    A cyclist maintains a constant velocity of 5.9 m/s headed away from point A. At some time the cyclist is 249 m from point A. What will be his displacement from the starting position after 65 s?
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    sabona Posts: 2, Reputation: 1
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    #2

    Sep 13, 2011, 11:05 PM
    A bat flying in a cave emits a sound and receives its echo .2 s later. How far away
    A bat flying in a cave emits a sound and receives its echo .2 s later. How far away is the cave wall? Assume the speed of sound to be 340 m/s. Answer in units of m.
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    Unknown008 Posts: 8,076, Reputation: 723
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    #3

    Sep 14, 2011, 12:40 PM
    1. Use the distance or displacement/speed formula

    Speed = Distance / Time taken

    Then add the distance that you got with the distance the cyclist already had from the point A.

    2. Remember that the distance that the sound covers is twice the distance to the wall. Can you try this out with the above formula?
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