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October 22, 2014

October 22, 2014

Posted by **nancy** on Friday, March 18, 2011 at 12:47pm.

Q1. How fast is the dog moving when its kinetic energy has been reduced by half?

Q2. By what fraction has its kinetic energy been reduced when its speed has been reduced by half?

- physics -
**Anonymous**, Friday, March 18, 2011 at 12:51pmke=1/2 m v^2

v=sqrt 2KE/m

so when KE is halved, what is sqrt .5 ?

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