1.

A projectile is thrown in the upward direction making an angle of \[\,60{}^\circ \] with the horizontal direction with a velocity of \[147\text{ }m{{s}^{-1}}\]. Then the time after which its inclination with the horizontal is \[45{}^\circ \], is

A. 15 s                 
B.        10.98 s
C. 5.49 s               
D.        2.74 s
Answer» D.        2.74 s


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