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    simmon's Avatar
    simmon Posts: 3, Reputation: 1
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    #1

    Feb 20, 2009, 03:10 AM
    Relative velocity
    Ball is thrown at 16.1 m/s inside a boxcar
    Moving along the tracks at 29.4 m/s .
    What is the speed of the ball relative to the
    Ground if the ball is thrown forward? Answer
    In units of m/s.
    sarnian's Avatar
    sarnian Posts: 462, Reputation: 9
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    #2

    Feb 22, 2009, 07:44 PM
    simmon


    This is your homework, and you have to do the thinking. I just provide hints.

    The car and everything in it is moving forwards at 29.4 m/s.
    So that ball is already moving forwards at 29.4 m/s.
    And than you add 16.1 m/s forwards to that.
    So what speed forwards will that ball have than?

    Brainteaser : what would (relative to the ground) the speed of the ball be, if thrown backwards at 29.4 m/s?
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