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A block of mass 20 kg is at rest on a flat surface. The coefficient of static friction of the block-plane is 0.4 , and

A block of mass 20 kg is at rest on a flat surface.  The coefficient of static friction of the block-plane is 0.4 , and the coefficient of kinetic friction is 0.3.  The block is pushed by a force T, which makes an angle of 37 degrees with the horizontal.  Define:
a.  The magnitude of the force T so that the block begins to move

 b.  After moving, determine the magnitude of the force T so that the block moves with constant velocity.
c.  The block is moving with an acceleration of 2.0 m/^2


m 37

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