In the system given, the conveyor belt delivers

each $"15-$kg$"$ crate to the ramp at A such that

the crate's speed is $"v_A=4\frac{m}{s}",$ directed down

along the ramp. If the coefficient of kinetic

friction between each crate and the ramp is $"{}_k=$

$0\mathrm{.}3",$ determine the speed at which each crate

slides off the ramp at $B.$ Assume that no tipping

occurs and $"=40".$