Question

if a car moving at a steady speed rounds a corner at 60 km/h, does it maintain a constant speed? maintain a constant velocity? defend your answers. match the words in the left column to the appropriate blanks in the sentences on the right.

Explanation:

Speed is a scalar quantity, only has magnitude. The car moves at a steady 60 km/h, so its instantaneous speed is constant. Velocity is a vector quantity with both magnitude and direction. When the car rounds a corner, its direction of motion changes. So it does not maintain a constant velocity.

Answer:

1. The instantaneous speed is constant and the direction of motion changes.
2. Thus, the car maintains a constant speed and it does not maintain a constant velocity.