An airplane is flying at 635 km per hour at an altitude of 35,000 m. What is its velocity?
A) 635 km/h
B) 16 m/min
C) 35 000 m/s
D) This cannot be determined without further information about its direction.
A velocity of an object is a vector quantity which means that it is concerned on both the magnitude and the direction. From the given, the magnitude is 635 km/hr but the direction is not given. Therefore, the velocity cannot be determined without the direction. The answer is letter D.