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November 20, 2014

November 20, 2014

Posted by **sel** on Monday, March 15, 2010 at 9:21am.

(b)At some other time, the velocity consists of only a j component. If the force is unchanged, and the instantaneous power is -12 W, what is the velocity of the object just then?

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**bobpursley**, Monday, March 15, 2010 at 10:19amwork=force dot dx

the dot product is scalar, so all the components (ii,jj,kk) are added.

b) power= d work/dt= d Force dot velocity/dt

-12watts= (4i-2j+9k) vj

vj= -12/-2 = 6j

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