Friday

October 24, 2014

October 24, 2014

Posted by **Barbara** on Saturday, October 24, 2009 at 12:58pm.

- science -
**NeedHelp!**, Saturday, October 24, 2009 at 2:33pmWell, work= force x displacement

(as you stated)

but if he lifts his pencil 20 cm, then lowers it back down to 20 cm, his displacement= 0

therefore, he did 0 joules of work

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