If a car is moving on a highway at 70 kilometers per hour, going south, and then turns to travel 70 kilometers per hour east, what happens to its speed and velocity?
Speed is constant, velocity is constant.
Speed is changing, velocity is constant.
Speed is changing, velocity is changing.
Speed is constant, velocity is changing***
Yes.
speedometer the same, compass different.
You are welcome.
To determine what happens to the speed and velocity of the car when it turns, we should first understand the definitions of speed and velocity:
- Speed is a scalar quantity that refers to "how fast an object is moving" and is calculated by dividing the distance traveled by the time taken.
- Velocity is a vector quantity that specifies "the rate at which an object changes its position in a particular direction" and is calculated by dividing the displacement (change in position) by the time taken.
In the given scenario, the car initially moves at a constant speed of 70 kilometers per hour, going south. The speed remains constant because the distance covered per unit time (70 kilometers per hour) does not change.
When the car turns to travel east while maintaining a speed of 70 kilometers per hour, the speed remains constant. The distance covered per unit time remains unchanged.
However, the velocity of the car changes because velocity is a vector quantity that includes both speed and direction. As the car changes its direction from south to east, the velocity changes. The car's velocity vector now points in a different direction, and the rate at which it changes its position also changes.
Therefore, the correct answer is: Speed is constant, velocity is changing.