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Posted by on Sunday, October 7, 2012 at 8:35pm.

Betty Bodycheck (mB = 60.0 kg, vB = 22.0 km/h in the positive x-direction) and Sally Slasher (mS = 46.3 kg, vS = 28.0 km/h in the positive y-direction) are both racing to get to a hockey puck. Immediately after the collision, Betty is heading in a direction that is 76.0° counterclockwise from her original direction, and Sally is heading back and to her right in a direction that is 12.0° from the x-axis.

What is their Kinetic Energy each?

  • Physics - , Sunday, October 7, 2012 at 8:40pm

    Lots of algebra here.

    Write the momentum equations in x and y directions, momentum has to be conserved in each direction.

    Once you find the velocity of the two girls, you can find the KE of each. Energy is probably not conserved.

  • Physics - , Sunday, October 7, 2012 at 8:52pm

    I found the velocity of the two girls. I found that Betty's velocity is 5.14 m/s and Sally's is 6.35 m/s. I'm just having with converting these into Kinetic Energy.

  • Physics - , Sunday, October 7, 2012 at 8:54pm

    I'm just having trouble with coverting these into Kinetic Energy.

  • Physics - , Sunday, October 7, 2012 at 8:58pm

    KE of each= 1/2 massgirl*v^2

  • Physics - , Sunday, October 7, 2012 at 9:00pm

    Ok Thanks a lot for your help

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