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Class 10 Class 12
A body travelling along a straight line traversed one-third of the total distance with a velocity 4 m/s. The remaining part of the distance was covered with a velocity 6 m/s for the other half of time. What is the mean velocity averaged over the whole time of motion?

Let s be the total distance travelled by body.

If t1 is the time taken to cover first one-third distance, then

Let t2 be the time for each of the remaining two journeys.

Then,

Therefore,

Average velocity =

=

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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.

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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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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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