there's this m2 question on projectiles which just has me stumpted at the moment... [M2, review exercise 1, question 9]
9. A golf ball is projected with speed 49ms-1 at an angle of elevation θ from a point A on the first floor of a golf driving range. Point A is at a height of 49/15m above horizontal ground. The ball first strikes the ground at a point Q which is at a horizontal distance of 98m from the point A.
a) Show that
6tan2θ - 30tanθ + 5 = 0
b) Hence find, to the nearest degree, the two possible angles of elevation.
c) Find, to the nearest secon, the smallest possible time of direct flight from A to Q.