## Question:

A bullet of weight ${ W }_{ 1 }$ traveling at ${ v }_{ 1 }$ strikes the wooden block of weight ${ W }_{ 2 }$ and exits the other side at ${ v }_{ 2 }$ as shown. Determine the speed of the block just after the bullet exits the block. Also, determine the average normal force on the block if the bullet passes through it in time Δt, and the time the block slides before it stops. The coefficient of kinetic friction between the block and the surface is ${ μ }_{ k }$. Units Used: ms = ${ 10 }^{ 3 }$s Given: ${ W }_{ 1 }$ = 0.03 lb , a = 3 ft , ${ W }_{ 2 }$ = 10 lb , b = 4 ft , ${ μ }_{ k }$ = 0.5 , c = 5 ft , Δt = 1 ms , d = 12 ft , ${ v }_{ 1 }$= 1300 ft/s , ${ v }_{ 2 }$= 50 ft/s