question_answer

A piece of marble is projected from earth's surface with velocity of 19.6 m/s at\[45{}^\circ \]. After 2 sec its velocity makes an angle \[\alpha \] with horizontal, where a is:

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

B) \[60{}^\circ \]     

C) \[0{}^\circ \]                            

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