## Chapter Chosen

Motion in Straight Line

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
A police van moving on a highway with a speed of 30 km h-1 fires a bullet at a thief’s car speeding away in the same direction with a speed of 192 km h-1. If the muzzle speed of the bullet is 150 m s-1, with what speed does the bullet hit the thief’s car ? (Note: Obtain that speed which is relevant for damaging the thief’s car).

Given,

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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.
1986 Views

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.
746 Views

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.
1215 Views

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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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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