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Motion in A Plane

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Physics Part I

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Physics

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

A Particle has initial velocity andleft parenthesis 3 space bold i with bold hat on top space plus 4 space bold j with bold hat on top right parenthesis has acceleration.left parenthesis 0.1 space bold i with bold hat on top space plus space 0.3 space bold j with bold hat on top right parenthesis Its speed after 10s is

  • 7 unit

  • 7 square root of 2 unit
  • 8.5 unit

  • 10 unit


B.

7 square root of 2 unit
From space first space equation space of space motion
straight v equals space straight u space plus at
straight v equals space 3 space bold i with bold hat on top space plus space 4 space bold j with bold hat on top space plus 10 space left parenthesis 0.4 space bold i with bold hat on top space plus 0.3 space bold j with bold hat on top space right parenthesis
straight v space equals space 7 space bold i with bold hat on top space plus space 7 space bold j with bold hat on top
vertical line straight v vertical line equals space 7 square root of 2
From space first space equation space of space motion
straight v equals space straight u space plus at
straight v equals space 3 space bold i with bold hat on top space plus space 4 space bold j with bold hat on top space plus 10 space left parenthesis 0.4 space bold i with bold hat on top space plus 0.3 space bold j with bold hat on top space right parenthesis
straight v space equals space 7 space bold i with bold hat on top space plus space 7 space bold j with bold hat on top
vertical line straight v vertical line equals space 7 square root of 2
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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 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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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.

Mass, temperature and energy
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Give three examples of vector quantities.

Force, impulse and momentum.
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