Question

小仙

一直卡住算不出來
求詳解
謝謝🙏

1. A building locates at x=dſ
with a height of h as shown
in the right figure. A cannon
at origin fires a bullet to
bomb the roof of the
building, please find out:
(a) what is the initial
velocity and angle should be
to complete this mission?
(b) how much time will it take to hit the target?
(c) how height the bullet can reach?
2. Similar to the problem #1,
now there is a mountain with
a height of 2h sitting at d/2.
The mission is the same,
2h T
firing a cannon to high the
roof of the building. Please/10
find out:
(a) what is the initial velocity
and angle should be to complete this mission by flying the bullet
over the mountain?
(b) how much time will it take to hit the target?
(c) how height the bullet can reach?