How do musical instruments vary pitch

An engineer designs a roller coaster so that a car travels horizontally for 162 ft, then climbs 127 ft at an angle of 31.0° above the horizontal. it then moves 127 ft at an angle of 46.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?