2. If a car is moving down a straight highway at a constant speed of 70 miles per hour, it has no net force acting on it. The engine has to keep running to overcome the constant force of friction that
is acting on the car by the road.
true
false
not enough information to determine

An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 137 ft at an angle of 34.0° above the horizontal. it then moves 137 ft at an angle of 48.0° 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.)

Which sound characteristic is not affected by the relative motion of an object

Match each scenario to the form of energy it represents