During World War I, the Germans had a gun
called Big Bertha that was used to shell Paris.
The shell had an initial speed of 2.05 km/s at
an initial inclination of 71.7
to the horizontal.
The acceleration of gravity is 9.8 m/s
Answer in units of s
This is the case of projectile motion and the time for which the shell was in the air can be called time of flight.
Time of flight t=2 u sin theta/g
This is the fimal answer.
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