Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time t1. On other days, if she remains stationary on the moving escalator, then the escalator takes her up in time t2. The time taken by her to walk up on the moving escalator will be from Physics Motion in A Plane Class 11 Manipur Board
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Motion in A Plane

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Physics Part I

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Physics

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Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time t1. On other days, if she remains stationary on the moving escalator, then the escalator takes her up in time t2. The time taken by her to walk up on the moving escalator will be

  • fraction numerator straight t subscript 1 space plus straight t subscript 2 over denominator 2 end fraction
  • fraction numerator straight t subscript 1 space straight t subscript 2 over denominator t subscript 2 minus t subscript 1 end fraction
  • fraction numerator straight t subscript 1 space straight t subscript 2 over denominator t subscript 2 plus t subscript 1 end fraction
  • t2-t1


C.

fraction numerator straight t subscript 1 space straight t subscript 2 over denominator t subscript 2 plus t subscript 1 end fraction
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Give three examples of vector quantities.

Force, impulse and momentum.
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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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