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Class 10 Class 12
A projectile is projected in horizontal direction with velocity u from height h. How long will it take to reach the ground?

Velocity of the particle = u 

Height at which the particle is projected = h

Let, time of flight be T

Using the equation, 

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#13 {main}</pre>

We have, y=h, yo = 0 and uy = 0 

Therefore, 

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#13 {main}</pre>

Time taken for the particle to reach the ground, T =square root of fraction numerator 2 straight h over denominator straight g end fraction end root 

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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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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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Give three examples of vector quantities.

Force, impulse and momentum.
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