Question

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

Answer 1

your goal is J ?

Answer 2

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

Answer 3

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

Answer 4

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