A golfer standing on level ground hits a...

A golfer standing on level ground hits a ball with a velocity of `u=52m//s` at an angle `alpha` above the horizontal. If `tantheta=5//12`, then the time interval for which the ball is at least 15 m above the ground (i.e. between A and B will be :(take `g=10m//s^(2)`)

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