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Motion in A Plane

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Physics Part I

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Physics

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Class 10 Class 12

A parachutist after bailing outfalls 50 m without friction. When a parachute opens, it decelerates at 2 m/s2. He reaches the ground with a speed of 3 m/s. At what height, did he bail out?

  • 91 m

  • 182 m

  • 293 m

  • 111 m


C.

293 m

straight s equals space 50 space plus open parentheses fraction numerator 3 squared minus left parenthesis 2 straight x 10 straight x 50 right parenthesis over denominator 2 left parenthesis negative 2 right parenthesis end fraction close parentheses
space equals space 293 space straight m
straight s equals space 50 space plus open parentheses fraction numerator 3 squared minus left parenthesis 2 straight x 10 straight x 50 right parenthesis over denominator 2 left parenthesis negative 2 right parenthesis end fraction close parentheses
space equals space 293 space straight m
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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 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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Give three examples of scalar quantities.

Mass, temperature and energy
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