Question

how can you say that a body is in motion? is it a common property?

Answer 1

Answer:

If there is a change in the position or state of the object , then the body is said to be in motion. Yes,it is a common property.

for example,running horse,vehicle moving,human running,jogging etc..

Answer 2

Body in motion:

• A body is said to be in motion only when it's instàntaneous position changes with respect to time as per a specific reference frame.

• Yes, it is a common property of an object.

So, a body can be at rest as well as in motion depending on the reference frame.

For example :

• A train pàssing a platform will be in motion with respect to the passengers standing on the platform.

• But it will be in rest with respect to the pàssengers travelling in the train.

Now, for position to change w.r.t time, the body must have a velocity as follows:

$v = \dfrac{\Delta x}{\Delta t} = \dfrac{x2 - x1}{t2 - t1}$

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