Answer
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Hint:In the above question, we need to know firstly about the states of motion. A body is at rest when it is not moving with respect to time and said to be moving when the position is not fixed with respect to time. But the classroom is at rest as it is not moving with respect to time.
Complete answer:
Before choosing the right option,Firstly, learning about the state of rest and the state of motion. A body is said to be at rest when it does not change its position with respect to the surroundings with time whereas a body is said to be in motion when the body changes its position with respect to the surroundings with time.In the above question, we are asked to tell the state of the classroom. Then the classroom is at rest, its position is not changing with respect to the surrounding with time.
So, the correct option is B.
Note:In some cases, we can say that the motion and rest are the relative terms. It is when the position is dependent on the frames of reference. Taking an example when a body is at rest in his frame but that body can be in motion with respect to the body moving with respect to the rest body.
Complete answer:
Before choosing the right option,Firstly, learning about the state of rest and the state of motion. A body is said to be at rest when it does not change its position with respect to the surroundings with time whereas a body is said to be in motion when the body changes its position with respect to the surroundings with time.In the above question, we are asked to tell the state of the classroom. Then the classroom is at rest, its position is not changing with respect to the surrounding with time.
So, the correct option is B.
Note:In some cases, we can say that the motion and rest are the relative terms. It is when the position is dependent on the frames of reference. Taking an example when a body is at rest in his frame but that body can be in motion with respect to the body moving with respect to the rest body.
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