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# Physics BMAT Question Watch

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1. 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... ?!
2. (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.
3. (Original post by RogerOxon)
Try thinking about the energy transfer.
okay... i got 9000J kinetic energy at the start... what do i do next?
4. (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
5. (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

Updated: October 19, 2016
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