Physics
posted by Karen .
An artillery shell is ﬁred at an angle of 75.7 above the horizontal ground with an initial speed of 1720 m/s.
The acceleration of gravity is 9.8 m/s^2.
Find the total time of ﬂight of the shell,neglecting air resistance. Answer in units of min.

Physics 
Elena
t= 2vₒ•sinα/g
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