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 theta$={40}^{\text{@}}.$