Question

what is the angle of projection for which time of flight is maximum and mention the expression for the same​

Answer 1

Answer:

Vy - g t = 0   where Vy is vertical component of velocity and t is the time to

                     reach maximum height.

t = Vy / g = V sin theta / g

So t will be a maximum when theta = 90 deg

T = 2 t     where t is the total flight time