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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 shot fired horizontally from the top of a tower with a velocity of 60 ft/s hits the ground in 2 seconds. What is the height of the tower and the distance from the foot of the tower where it strikes the ground?

Here,
Time taken for the shot to reach the ground, t = 2s.

Velocity in horizontal direction, u = 60 ft/s

The height of the tower = distance fallen by shot in 2s 

That is, 

space 1 half gt squared equals 1 half cross times 32 cross times left parenthesis 2 right parenthesis squared equals 64 space ft 

The distance from the foot of the tower where it strikes the ground, s= ut = 60 x 2 = 120 feet. 

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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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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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