A car traveling at 20 km/hr north for an hour and then travels at 20 km/hr west for an hour has NOT changed its speed.
The speed of an object shows the distance movement by the object in a specified time. So, we can say speed = distance/time and it is measured in km/hr or m/s.
The direction of an object is the path in which an object moves and navigates.
The velocity of an object is the change of an object speed with its direction,
The acceleration of an object is the rate at which the velocity of an object is changing with time.
From the given information,
- the car first goes North at = 20 km/hr
- and then goes West at = 20 km/hr
It has change its direction, which will affect the change of the velocity and the acceleration.
Therefore, we can conclude that only the speed of the car has not been changed in the whole movement.
Learn more about scalar and vector quantities here:
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