Question

A ball mass 1 kg moving with speed $10{ms}^{-1}$ strikers a wall and comes to rest. The impulse of the force on the ball is of magnitude

• A. $5kg{ms}^{-1}$
• B. $10kg{ms}^{-1}$
• C. $15kg{ms}^{-1}$
• D. $20kg{ms}^{-1}$

Answer 1

The correct option is B $10kg{ms}^{-1}$

Initial velocity $u=10m/s$ and final velocity $v=0\left(rest\right)$

so the change in momentum will be $\Delta P=m\Delta V=m(v-u)=1kg(0-10)=-10Kgm/s$

So magnitude of the impulse will be $10Kgm/s$