Question

A particle of mass $\left(m\right)$ revolving in horizontal circle of radius $\left(R\right)$ with uniform speed $v$. When particle goes from one end to other end of diametre then

• A. $K.E.changeby\frac{1}{2}m{v}^2$
• B. $K.E.changebym{v}^2$
• C. no change in momentum
• D. change in momentum is $2mv$

Answer 1

The correct option is D change in momentum is $2mv$

The particle at point A is moving with a velocity $v$ and reaches the diametrically opposite end $B$

Change in momentum, $\Delta P=mv-(-mv)=2mv$