Question: A projectile is projected with 𝑎 speed 𝑢 making an angle 2𝜃 with the horizontal. What is the speed when its direction of motion makes an angle θ with the horizontal
(A) (𝑢 cos 2𝜃)/2
(B) 𝑢 cos 𝜃
(C) 𝑢(2 cos 𝜃 − sec 𝜃)
(D) 𝑢(cos 𝜃 − sec 𝜃)
Answer: option (D)
Solution:
