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September 20, 2014

September 20, 2014

Posted by **K** on Tuesday, December 8, 2009 at 5:32pm.

The answer is 0J of work, and i understand the method of equations, but i dont understand the logic behind it.

Thanks for any help.

- Physics 221 -
**drwls**, Tuesday, December 8, 2009 at 6:48pmYou are not changing the kinetic energy and you do not have to change the potential energy to change direction. Therefore no work is required, if the reversal is done in a frictionless manner.

You could let its direction be reversed by a spring, or by a U-shaped skateboard ramp, for example.

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