﻿ The position of particle at any instant is given by . At what instant the velocity vector will make an angle 45° with X-axis? from Physics Motion in A Plane Class 11 Manipur Board

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The position of particle at any instant is given by At what instant the velocity vector will make an angle 45° with X-axis?

Given,

Position of the particle,

∴ Velocity,

The angle which the velocity vector makes with X-axis at any instant is,

Here,

Therefore,

So, when time is 5 seconds, the velocity vector will make an angle 450 with x-axis.

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

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