A body is sliding down an inclined plane have coefficient of friction 0.5. If he normal reaction is 4 times that of resultant downward of force along the incline, find the angle between the inclined plane and the horizontal.

A body is sliding down an inclined plane have coefficient of friction

1.	A body is sliding down an inclined plane have coefficient of friction 0.5. If he normal reaction is 4 times that of resultant downward of force along the incline, find the angle between the inclined plane and the horizontal.
Answer» `45^(@)` `53^(@)` `37^(@)` `60^(@)` ANSWER :C