difference between speed & velocity?
1. Speed is distance travelled per unit time while Velocity is displacement per unit time.
2. Speed does not give any information on the direction of the moving body while Velocity gives information on the speed and direction of the moving body.
3. Speed is a scalar quantity Velocity is a vector quantity.
Example: A truck is moving at a "speed" of 70 km per hour. Describes speed of the truck.
A truck is moving at a "velocity" of 70 km per hour towards the North. Describes velocity of the truck.