Question

Q6 A body of mass m is moving with velocity v along a straight line as shown in figure. The direction of its momentum is along
1. OX
2 OY
3. OX
4. OY​

Answer 1

Answer:

Explanation:

Consider initial position of particle is

r=x

i

^

+y

j

^

​

As the particle moves parallel to x-axis with constant velocity.

So, r=v

i

^

= constant

The angular momentum of particle is given by

L=r×p=v×mv

=m(x

i

^

+y

j

^

​

)×(v

i

^

)=mvy(

j

^

​

×

i

^

)

L=−mvy

k

^

.

Since, v and y are constants, so L is also constant.