Question: A fighter plane enters inside the enemy territory, at time 𝑡 = 0 with velocity 𝑣0 = 250 ms−1 and moves horizontally with constant acceleration 𝑎 = 20ms −2 (see figure). An enemy tank at the border, spot the plane and fire shots at an angle θ = 60° with the horizontal and with velocity 𝑢 = 600 ms −1 . At what altitude 𝐻 of the plane it can be hit by the shot?

(A) 1500√3m
(B) 125 m
(C) 1400 m
(D) 2473 m
Answer: option (D)
Solution:
