Question

a train takes 2 hours to reach station B from station a and then she ask to return from station to station at the distance between the two stations is 200 cm find the average speed and average velocity​

Answer 1

Hey there!

Given,

Time taken to reach station B from A = 2 hours = 2 * 60 s = 120 s

Distance covered in when moving from station B to A = 200 cm = 2 m

And,

Time taken to go back to station A = 120 s

Distance covered again in going back = 2 m

Now,

Total distance = (2 + 2) m = 4 m

Total time = (120 + 120) s = 240 s

We know,

Average speed = total distance / total time

                          = 4 m / 240  s

                        = 1 / 60 m/s

And, average velocity will be zero because the body comes back to its initial position,.

Hope It Helps You!

               

Answer 2

Answer:

i)  average speed s= d/t*2

  2h*2=4

   200cm*2=400cm

   d= distance

    t=time

    s=d/t,

   s=400/4

   100cmph,

Ii) average velocity=0

Explanation:

the average speed should times two as she traveled too and from with with same given time and speed

the average velocity can not be measured in the sense that the actual displacement cannot be found

Difference between Average Speed and Average Velocity:

There is often confusion over the difference between average speed and average velocity. In general usage, they are often substituted for each other. But in the world of Physics, speed and velocity are two distinctly different entities. Speed is a Scalar quantity whereas velocity is a Vector quantity. In effect, it means that speed does not require a direction but velocity needs direction.

It is enough to say that the speed of an object says, 25 m/s but on the other hand, the expression for the velocity of the same object will be 25 m/s, east (or any other direction). In the same vein, average speed and average velocity are direction unaware and direction aware respectively.

Average Velocity

For instance, if a remote controlled car is moving rapidly from Point A to Point B and back to Point A, there is no overall displacement of the car. In that case, the speed of the car can be measured but not its velocity. If the same car moves from Point A to Point B and stays there, there is definite displacement in a certain direction. It can be measured in such cases. In simpler words, average velocity is just the average speed with a direction.