15-15 The chute shown in Fig. P15-15 is 20 ft long and is used to transfer boxes from the street into the basement of a store. The kinetic coefficients of friction are $\mu_k = 0.25$ between the box and the chute and $\mu_k = 0.40$ between the box and the basement floor. If a 30-lb box is given an initial velocity of 10 ft/s when it is placed on the chute, determine
a. The velocity of the box as it leaves the end of the chute.
b. The distance $d$ that the box will slide on the basement floor after it leaves the end of the chute.
