Henr =y

d = Vo*t + 4.9t^2 = 15, 0 + 4.9t^2 = 15, t^2 = 3.06, t = 1.75s. = Time to fall 15m. Therefore, the 1st stone had a 1.75s headstart: d1 = 0 + 4.9t^2 = 75 t^2 = 15.31, t1 = 3.91s. t2 = 3.91 - 1.75 = 2.16s. d2 = Vo*t + 4.9t^2 = 75, 2.16*Vo + 4.9(2.16)^2 = 75...