Motion in A Plane

Physics Part I

Physics

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A ball thrown up is caught by the thrower 4 s after start. What is the height to which the ball has risen?

Time of ascent = Time of descent.Â

Therefore,Â

t_{1} + t_{2} = 4

t_{2} + t_{2} = 4

This implies,Â

t_{2} = 2 sec

Now, taking vertical downward motion of the ball from the highest point to surface of earth we have,Â

u = 0, a = 10 m/s, t = 2 s, s = ?Â

Now, using the formula,

Â Â Â Â Â Â Â Â Â Â Â s = ut + 1/2 at^{2}

Â Â Â Â Â Â Â Â Â Â Â Â Â =Â Â

Â Â Â Â Â Â Â Â Â Â Â Â Â = 20 m

This is the height to which the ball has risen.Â

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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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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.Â

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