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    xxjazzie's Avatar
    xxjazzie Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 8, 2009, 02:21 PM
    I don't understand how to use projectile
    A cat chases a mouse across a 1.3 m high
    Table. The mouse steps out of the way, and
    The cat slides off the table and strikes the floor
    1.0 m from the edge of the table.
    The acceleration of gravity is 9.81 m/s2 .
    What was the cat’s speed when it slid off
    The table?
    Answer in units of m/s.
    elscarta's Avatar
    elscarta Posts: 118, Reputation: 20
    Junior Member
    		  
    #2

    Oct 9, 2009, 04:25 AM

    First of all consider what happens vertically.

    Initial vertical speed of cat = 0m/s
    g = 9.81m/s2
    distance the cat fell = 1.3 m

    use the formula d = ut +1/2 gt^2 you have all values except t so solve for t.

    1.3 = 0 x t + 1/2 x 9.81 t^2
    1.3=4.905t^2
    t^2=1.3/4.905
    t=square root (1.3/4.905)
    t= 0.515 seconds

    now consider what is happening horizontally
    the cat moved a distance of 1.0m in a time of 0.515 s

    so v = d/t
    v= 1/0.515
    v = 1.9 m/s
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