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    irinim22's Avatar
    irinim22 Posts: 1, Reputation: 1
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    #1

    Nov 19, 2011, 05:55 PM
    Calculate speed
    If a ball is thrown horizontally with an initial velocity of 30 m/s. hits field 4 seconds later. What is its speed the instant before it hits the field?
    Aurora2000's Avatar
    Aurora2000 Posts: 111, Reputation: 16
    Junior Member
    		  
    #2

    Nov 20, 2011, 03:06 PM
    Assuming no friction, horizontal component will not change. Vertical component increases as
    a free fall, thus , thus after 4 seconds you have .
    The total speed can be obtained from
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