A body of mass m kg is projected from a point A up the line of greatest slope of a plane inclined at 20 to the horizontal, as shown. The initial speed of the body is 10 ms. 10ms 20 (a) Assuming that the plane is smooth, find (i) the acceleration of the body (ii) the distance it travels up the plane before coming instantaneously to rest. In fact the plane is rough. The coefficient of friction between the body and the plane is u. The body comes to rest after 9 m. (b) Calculate the value of . (c) Show that the body slides back down the plane, arriving at A with speed 4.55 ms.