A concave mirror of radius of coverture 30cm produces an inverted image 3 times the size of the object placed in front of it. Determine the object position, image position and most especially the nature of image​

Ablock having mass m slides down an inclined plane. the force of friction between the block and the inclined plane is f, the block's weight is m g, and the normal force is n. (a) draw a free – body force diagram showing the forces acting on the block. (b) write down all relevant newton’s equations for a given situation.