What is the shape of trajectory of a projectile?

Parabola.
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Two particles A and B are moving with same velocity in the same direction along a straight line. What is the relative velocity of B w.r.t. A?

Zero.
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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 is a scalar quantity?


A physical quantity that requires only magnitude for its complete specification is called a scalar quantity.
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A body is projected with velocity u at angle θ with horizontal. What is the maximum height attained by body?

Maximum height is the maximum vertical height attained by the object above the point of projection during it's flight.

It is denoted by H and is given by, 

                       

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