which statement is an example of velocity?
A. a ball rolls 50 centimeters away from the table
B. a skateboard moves 2 meters per second
C. a car travels east at 55 kilometers per hour
D. a student walks 20 meters down the sreet
B. a skateboard moves 2 meters per second
on a position-time graph which of the following does the value of the slope indicate about the object?
change in position
change in direction
total distance
velocity
The value of the slope on a position-time graph indicates the velocity of the object.
C. a car travels east at 55 kilometers per hour
The statement that is an example of velocity is C. "a car travels east at 55 kilometers per hour."
Velocity is a vector quantity that measures the rate at which an object changes its position in a specific direction. It includes both the speed of the object and the direction in which it is moving.
To determine which statement represents velocity, we need to look for both a magnitude (speed) and a direction. Let's analyze each statement:
A. "a ball rolls 50 centimeters away from the table" - This statement provides only the distance covered by the ball but does not specify the direction, so it does not represent velocity.
B. "a skateboard moves 2 meters per second" - This statement provides both the speed (magnitude) of the skateboard (2 meters per second) but does not mention the direction, so it does not represent velocity.
C. "a car travels east at 55 kilometers per hour" - This statement provides both the speed (magnitude) of the car (55 kilometers per hour) and the direction (east), making it an example of velocity.
D. "a student walks 20 meters down the street" - This statement provides only the distance covered by the student but does not specify the direction, so it does not represent velocity.
Therefore, option C is the correct answer and represents velocity because it includes both speed and direction.