Physics BMAT Question

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Size:  92.3 KBI can't do this... tried using momentum and speed equals distance/time... just not sure how to find force... do I use change in momentum /time? But I dunno the time... ?!
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    (Original post by Uni12345678)
    I can't do this... tried using momentum and speed equals distance/time... just not sure how to find force... do I use change in momentum /time? But I dunno the time... ?!
    Try thinking about the energy transfer.
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    (Original post by RogerOxon)
    Try thinking about the energy transfer.
    okay... i got 9000J kinetic energy at the start... what do i do next?
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    (Original post by Uni12345678)
    okay... i got 9000J kinetic energy at the start... what do i do next?
    Something does negative work on the bullet to cause it to lose kinetic energy.

    P.S. You might want to check that kinetic energy calculation
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    (Original post by RogerOxon)
    Something does negative work on the bullet to cause it to lose kinetic energy.

    P.S. You might want to check that kinetic energy calculation
    ah i got it, the bush does work equal to the kinetic energy of the bullet in order to stop it. So you use work done= distance x force to work out the force the bush exerts. i got 3.75 x 10^3
    thank you
 
 
 
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