Time of flight of a ground to ground projectile is measured to be 2s by a student, but he forgot to measure the actual angle of projection. He estimated it to be between 30° and 60°. According to his

Question

Time of flight of a ground to ground projectile is measured to be 2s by a student, but he forgot to measure the actual angle of projection. He estimated it to be between 30° and 60°. According to his estimation, the CORRECT statement(s) is/are :-

TestHub · Accepted Answer

Time of flight 2 s gives u sin θ = g T /2 = 10 m/s. Range: R = 2 ( u sin θ ) ( u cos θ ) / g = 20/ tan θ . For θ = 30 deg: R = 20 3 ​ m (maximum); for θ = 60 deg: R = 20/ 3 ​ m (minimum). (A) R cannot exceed 20 3 ​ m - correct. (B) R cannot be less than 20/ 3 ​ m - correct. (C), (D) incorrect. Correct options: A, B

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