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Class 10 Class 12
Two persons A and B are walking with speed 4 km/hr and 5 km/hr respectively in the same direction. Find how far will be B from A after 3 hours?

Relative velocity of B w.r.to A,

vBA = vB - vA

= 5- 4 = 1 km/hr

Therefore, distance of B ahead of A in time is,

d = vAB x t

= 1 x 3

= 3 km

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Give three examples of vector quantities.

Force, impulse and momentum.
865 Views

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 vector quantity?

A physical quantity that requires direction along with magnitude, for its complete specification is called a vector quantity.
835 Views

Give three examples of scalar quantities.

Mass, temperature and energy
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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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