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May 29, 2015

Homework Help: physics

Posted by ashlee on Sunday, January 20, 2013 at 8:42am.

A 5-kg crate is resting on a horizontal plank. The coeffi-
cient of static friction is 0.5 and the coefficient of kinetic
friction is 0.4. After one end of the plank is raised so
the plank makes an angle of 25
with the horizontal, the
force of friction is?

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