Question

A particle is moving along a straight line parallel to x-axis with constant velocity . Find angular momentum about the origin in vector form

• A. $+m{v}^{2}b\hat{k}$
• B. $mb\hat{k}$
• C. $2mvb\hat{k}$
• D. $mvb\hat{k}$

Answer 1

The correct option is A $+m{v}^{2}b\hat{k}$

A particle is moving along a straight line $\parallel$ to $x$-axis.

Position vector $\left(\hat{r}\right)=b\hat{j}$

Mass of body= $m$

Velocity of body $\hat{V}=V\hat{i}$

Angular momentum= $m(\hat{r}\times \hat{V})=mbV\hat{k}$