Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction

Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction Correct Answer At an angle equal to the angle of friction to the inclined plane

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The angle of inclination of the plane, at which the body begins to move down the plane is called
The angle of inclination of the plane at which the body begins to move down the plane, is called