George walls to a friend's house. He walks 750 meters north, then realizes he walked too far. He turns around and walks 250 meters south. The entire walk takes him 13 seconds. His speed is 76.92 miles per second. What is his velocity?

His velocity is 38.46 m/s south

Explanation:

Velocity is a vector quantity that measures displacement over time

George walks 750 meters north

Then he turns around and walks 250 meters south

The entire walk takes him 13 seconds

His speed is 76.92 meters per second

We need to find his velocity

He walks north for 750 meters and then walks to south 250 meters, so

his displacement is the difference between the final position and

the initial position

His displacement = 250 - 750 = - 500

The negative sign means he moves in opposite direction

The displacement is 500 to south

The time of his trip = 13 seconds

Velocity = displacement : time

→ Velocity = - 500 : 13 = - 38.46 m/s

His velocity is 38.46 m/s south