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Class 10 Class 12
A particle A is moving along a straight line with velocity 5 m/s and another particle B has a velocity 8 m/s at angle 37° to the path of A. Find the relative velocity of B w.r.t. A.

Consider,  be the velocities of particles A and B respectively.

The relative velocity of B relative to A is given by,

To find  we will first change  into  and then add to  as shown in figure.

We can see that,   makes an angle of  with .

Therefore  will subtend an angle  with

Now,
So,

The angle that the relative velocity makes with  is,

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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.

814 Views

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

What is a scalar quantity?

A physical quantity that requires only magnitude for its complete specification is called a scalar quantity.
1212 Views

Give three examples of scalar quantities.

Mass, temperature and energy
769 Views