## Question:

The ball A of weight ${ W }_{ A }$ is thrown so that when it strikes the block B of weight ${ W }_{ B }$ it is traveling horizontally at speed v. Determine the average normal force exerted between A and B if the impact occurs in time Δt. The coefficient of restitution between A and B is e. Given: ${ W }_{ A }$ = 1 lb , ${ μ }_{ k }$ = 0.4 , ${ W }_{ B }$ = 10 lb , v = 20 ft/s , g = ${ 32.2ft/s }^{ 2 }$ , e = 0.6 , Δt = 0.02 s