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## anonymous 4 years ago a ball of mass 0.2 kg strikes a wall when moving horizontally at 12m/s. if the ball rebounds horizontally at 8m/s, find the impulse exerted by the wall

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1. anonymous

your goal is J ?

2. anonymous

if yes j is:$\Delta p=j \rightarrow p _{2}-p _{1}=j$ $p _{2}=mv _{f}$ $p _{1}=mv _{i}$so j yeilds -0.8 neg sign for direct of j i thnk

3. anonymous

I=ft ft = mv-mu ft = (0.2)(-8)-(0.2)(12) = -2.56N*s... i think so..

4. anonymous

sorry...the answer is -4J / 4N*s

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