A hockey ball of mass $$200\ g$$ hits on a hockey stick with a velocity $$10\ m/s$$. Calculate the change in momentum if the ball bounces back on the same path with the same speed.
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$$m=200g=200/1000=0.2\ kg$$ initial momentum $$=mu$$ $$=0.2 \times 10=2\ kg\ m/s$$ Final momentum $$=mv$$ $$=0.2 \times 70=2\ kg m/s$$ Change in momentum $$=mv-mv=-2-2$$ $$=-4\ kg\ m/s$$
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