Which statement best describes the difference between speed and velocity? A. Velocity is speed with a direction. B. Speed is vel
2 answers:
Explanation:
The total distance travelled by an object divided by total time taken is called the speed of an object. Its formula is given by :
Speed is a scalar quantity. It has only magnitude but no direction.
The total displacement of the particle divided by total time taken is called the velocity of that object. It is given by :
D is the displacement or shortest path covered
Velocity is a vector quantity. It have both magnitude and direction.
Both speed and velocity of an object are same. The only difference is that the speed is a scalar quantity while the velocity is a vector.
The statement that best explains the difference between velocity and speed is (A) i.e. "Velocity is speed with a direction".
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The final combined velocity after the collision is 20.2 m/s
Explanation:
We can solve this problem by using the law of conservation of momentum: in fact, in absence of external forces, the total momentum of the two car and of the truck must be conserved before and after the collision.
This means that we can write the following equation:
where:
is the mass of the sport car
is the initial velocity of the car (taking its direction as positive direction)
is the mass of the truck
is the initial velocity of the truck
is the final combined velocity of the car and the truck, after the collision
Re-arranging the equation and substituting the values, we find the velocity after the collision:
And the positive sign indicates their final direction is the same as the initial direction of the two vehicles.
Learn more about momentum here:
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