Question

A body of mass $0.05kg$ travelling with a velocity of $5m/s$ make angle of ${30}^0$ with the wall as shown. The body rebounds with the same speed making an angle of ${30}^0$ with the wall. Find the change in momentum of the body.

• A. $0.20N-s$
• B. $0.25N-s$
• C. $0.35N-s$
• D. $0.50N-s$

Answer 1

The correct option is B $0.25N-s$


Change in momemtum is
$\Delta p=m(v-u)=0.05\times (5/2-(-5/2\left)\right)=0.25N-s$