﻿ The magnitude of the resultant of  is P; If direction of  is reversed, the resultant is Q. Show that               from Physics Motion in A Plane Class 11 Manipur Board

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The magnitude of the resultant of  is P; If direction of  is reversed, the resultant is Q.
Show that

Let  be the  angle between two vectors

∴                    ...(1)

If direction of  is reversed then, then angle between  becomes

∴           .

...(2)

Adding (1) and (2), we get

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What is a vector quantity?

A physical quantity that requires direction along with magnitude, for its complete specification is called a vector quantity.
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Give three examples of vector quantities.

Force, impulse and momentum.
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Give three examples of scalar quantities.

Mass, temperature and energy
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What are the basic characteristics that a quantity must possess so that it may be a vector quantity?

A quantity must possess the direction and must follow the vector axioms. Any quantity that follows the vector axioms are classified as vectors.

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What is a scalar quantity?

A physical quantity that requires only magnitude for its complete specification is called a scalar quantity.
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