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Motion in A Plane

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Physics Part I

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

Two buses started simultaneously towards each other from towns A and B which are 480 km apart. It took the first bus travelling from A to B eight hours to cover the distance and the second bus travelling from B to A, ten hours. Determine when the buses will meet after starting and at what distance from A. 

Here, distance between two towns A and B, S = 480 km 

v1 = S/8   and
v2 = S/10

If these buses meet after time t,  then 

S/8 x t + S/10 x t = S 

On solving, we get 

t = 40/9 hours 

Therefore, distance from A = 480/80 x 40/9 = 800/3 = 266.7 km 


Give three examples of scalar quantities.

Mass, temperature and energy

What is a scalar quantity?

A physical quantity that requires only magnitude for its complete specification is called a scalar quantity.

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. 


What is a vector quantity?

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

Give three examples of vector quantities.

Force, impulse and momentum.

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