Question

A ball of mass $600gm$ strikes a wall with a velocity of $5m{s}^{-1}$ at an angle ${30}^o$ with the wall and rebounds with the same speed at the same angle with the wall. The change in momentum of the ball is, $\left(inkgm{s}^{-1}\right)$

• A. $15$
• B. $10$
• C. $5$
• D. $3$

Answer 1

The correct option is D $3$

momentum changes only perpendicular to the wall

change in momentum=$0.6\times 5\times sin{30}^0-(-0.6\times 5\times sin{30}^0)=3kgm{s}^{-1}$