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October 1, 2014

October 1, 2014

Posted by **Justin** on Sunday, October 8, 2006 at 3:35pm.

While a roofer is working on a roof that slants at 40.0 degrees above the horizontal, he accidentally nudges his 85.0 N toolbox, causing it to start sliding downward, starting from rest.

If it starts 5.00 m from the lower edge of the roof, how fast will the toolbox be moving just as it reaches the edge of the roof if the kinetic friction force on it is 22.0 N?

Answer expressed in m/s.

Take the toolbox weight, break it into two components, normal and down the roof. Then right the force equation

net force= mass*acceleration

forcedown - friction = mass*acceleration.

solve for acceleration. Then,

Vf= sqrt (2*acceleration*distance)

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