Respuesta :
newton 1st law: w no external force, a body will stay at rest or in constant uniform motion.
a motor raises the car up the tower. cuz it moves w/ constant vel, there is no external force: the motor force is the same n in opposity direction as the gravity force on car.
Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.
Since the car has a constant velocity from point C to point A, there is no external force - the motor force must be equal to the gravity force on the car.