Final answer:
The ratio of speed to the magnitude of velocity when a body is moving in one direction is equal to one. For example, if a car is traveling at a constant speed of 60 miles per hour in a straight line, the magnitude of its velocity is also 60 miles per hour.
Step-by-step explanation:
The ratio of speed to the magnitude of velocity when a body is moving in one direction is equal to one (c).
Speed is the magnitude of velocity and is a scalar quantity, meaning it only has magnitude and no direction. When an object moves in a straight line, the speed and magnitude of velocity are the same.
For example, if a car is traveling at a constant speed of 60 miles per hour in a straight line, the magnitude of its velocity is also 60 miles per hour. The ratio of speed to magnitude of velocity is 60/60 = 1.
Learn more about speed and velocity