ï»¿ A ship A is moving Westwards with a speed of 10 kmh-1 and a ship B 100km Â south of A, is moving Northwards with a speed of 10 kmh-1. The time after which the distance between them becomes shortest is from Physics Motion in Straight Line Class 11 Manipur Board

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A ship A is moving Westwards with a speed of 10 kmh-1 and a ship B 100km Â south of A, is moving Northwards with a speed of 10 kmh-1. The time after which the distance between them becomes shortest is

• 0 h

• 5 h

B.

5 h

It is clear from the diagram that the shortest distance between the ship A and B Â is PQ.

It is clear from the diagram that the shortest distance between the ship A and B Â is PQ.

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Can a body be always at rest in some frame?

Yes, a body is always at rest in a frame which is fixed with the body itself.
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What is the most essential thing to study the motion of a body?

The most essential thing to study the motion is reference frame. Rest and motion are relative terms. It means that an object in one situation can be in rest but in another situation, the same object will be in motion.
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What is rest?

When an object does not change its position with time, with respect to it's surroundings. In such a case the object is said to be at rest.
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What is motion?

When an object changes it's position with time, with respect to it's surroundings, the object is said to be in motion.
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Is absolute rest or absolute motion possible?

Absolute rest and absolute motion is not possible because there is no point in the universe which is at rest and can be taken as point of reference. The planet Earth is in continuous motion.
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