Homework Help: mary

Posted by physics on Sunday, June 7, 2009 at 8:50pm.

The question is: a horizontal force of magnitude 22.0 N is applied to a 2.86 kg book as the book slides a distance d = 0.73 m up a frictionless ramp at angle θ = 30°. The book begins with zero kinetic energy. What is its speed at the end of the displacement?

I did W=fdcos(theta) and found the amount of work to be 13.91J.

I then thought maybe you use the equation K=(1/2)mv^2
and rewrite as W=(1/2)mv^2
in which case v=3.12m/s

but this was wrong.

any guidance is appreciated! THANKS

mary - MathMate, Monday, June 8, 2009 at 12:09am
See:
http://www.jiskha.com/display.cgi?id=1244428188

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