Question

A train travels a distance of 200km with an average speed of 40kmh-1. How much time does it take to cover the distance? Comment on the statement “rest and motion are relative terms”.Give example​

Answer 1

Answer:

5 hours to cover the total distance

time = distance / speed

200/40

Answer 2

Answer:

5 hours

Explanation:

Time taken = Distance travelled/Speed

Time taken = 200km/(40km h^-1)

Time taken = 5 Hours

                              (OR)

Also this can be done logically, when a train is going at 40km/h then for one hour it will go 40 km, similarly, when it goes 200 km, then something was multiplied with that 40 to get 200

So Basically what was multiplied was 5

So 5 hours is the time taken

Rest and Motion are relative terms because they depend on the frame of reference. A frame of reference is  the point/frame from which the body which is either moving or at rest is observed.

As seen in the above case of a train, when the train is observed from a point outside the train, say a platform, then the train is said to be moving

But when the train is seen from another train which is going in the same direction and same speed as the first train then both the trains are said to be at rest when see from each of the trains

Hope it helps!