A ball is thrown at 30° with horizontal from the top of roof 20 m high with a speed of 13 m.s-1. At what distance from the throwing point will the ball, once again be at a height of 20 m from the ground? (g = 10 m.s-2)
1
10.2 m
2
14.6 m
3
18.6 m
4
9.8 m
5
None of the above/More than one of the above.