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erisedk
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Homework Statement
A force exerts an impulse J on a particle changing its speed from u to 2u. The applied force and the initial velocity are oppositely directed along the same line. The work done by the force is--
Ans: Ju/2
Homework Equations
Impulse= force*time
impulse=change in momentum
The Attempt at a Solution
Since applied force and initial velocity are oppositely directed, J=m(2u-(-u))=3mu.
Work=Force*displacement=Impulse*displacement/time=Impulse*velocity
But velocity is not constant. I don't know what to do from here.