9(a) The range of a rifle bullet is 1200 yards when a is the angle of elevation of projection. Show that if the rifle bullet is fired with the same elevation from a car travelling at 10 miles per hour towards the target, the range will be increased by 220-/tan a (b) A ball is dropped from the top of a tower of height h. At the same moment, another ball is thrown from a point of the ground at a distance k from the foot of tower so as to strike the first ball at a depth d. Show that the initial speed and the direction of projection of the second ball are respectively g(h2+k) h and tan 2d 8