Askier starts from rest at the top of a 45.0-m-high hill, skis down a 30° incline into a valley, and continues up a 40.0-m-high hill. the heights of both hills are measured from the valley floor. assume that you can neglect friction and the effect of the ski poles. how fast is the skier moving at the bottom of the valley? what is the skier’s speed at the top of the next hill? do the angles of the hills affect your answers?