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    iceberg1002's Avatar
    iceberg1002 Posts: 42, Reputation: 1
    Junior Member
    		  
    #1

    Mar 12, 2012, 07:47 PM
    I need help with my homework
    If a head on automobile collision,a person momentum could be reduced from 2000kgm/s to zero in just 0.1s . If this occurs the average force exerted to stop the person is

    1.200 N
    2.2000 N
    3. 20,000 N
    4. can't answer without knowing the person name.
    Here is my answer 200*0.1s equals to 200N am I'm right
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Mar 19, 2012, 11:35 AM
    Not quite right. From principles of impulse and momentumm:



    Here you have t = 0.1s and = 200 Kg m/s. Solve for F.
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