question_answer 64)

                  A woman throws all object of mass 500 g with a speed of \[25\,m{{s}^{-1}}\] .                 (a) What is the impulse imparted to the object?                 (b) If the object hits a wall and rebounds with half the original speed, what is the change in momentum of the object?

Answer:

                  (a) Impulse = change in momentum                        \[\frac{500}{1000}\,\times \,25\,\,=12.5\,\,Ns\]                 (b) Change in momentum \[=m\,[u-(-\upsilon )]\]                 \[~=m(u+\upsilon )=0.5(25+12.5)\]                 \[=18.75\text{ }kg\text{ }m{{s}^{-1}}\]