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Class 10 Class 12
A truck travelling due north at 20 m/s turns left and travels at same speed. Find the change in velocity.

Consider, unit vector along north is  and that along west is

Thus,

Velocity of truck travelling due north,

Velocity of truck west,

Now the change in velocity of truck is,

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Give three examples of vector quantities.

Force, impulse and momentum.
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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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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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