question_answer

A particle has been projected at certain angle \[\text{ }\!\!\theta\!\!\text{ }\]with the horizontal, find the value of \[\text{ }\!\!\theta\!\!\text{ }\] for which the particle hits the ground in such a manner that initial and final velocity vectors are at \[90{}^\circ \].

A) \[60{}^\circ \]

B) \[30{}^\circ \]

C) \[45{}^\circ \]

D)  For any value of \[\text{ }\!\!\theta\!\!\text{ }\]

Correct Answer: C

Solution :

From the diagram shown \[2\theta ={{180}^{o}}-{{90}^{o}}\] \[\theta ={{45}^{o}}\]