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February 28, 2015

February 28, 2015

Posted by **Jonathan** on Thursday, November 10, 2011 at 7:22pm.

(a) What is its kinetic energy in joules?

(b) What is the bullet's kinetic energy if its speed is halved?

(c) What is the bullet's kinetic energy if its speed is doubled?

- physics -
**Steve**, Thursday, November 10, 2011 at 7:34pmK = 1/2 mv

^{2}

plug in your numbers for m and v to get K.

Since K varies as v^{2}, if the speed changes by a factor of 2, the energy changes by a factor of 2^{2}=4

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