Golf ball equation for Projectile Motion need to know if I am doing it correctly

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sophiegirl411
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Homework Statement



A golfer hits the ball with an initial speed of 109km/hr
A) What is the longest hole in one (in km) that he golfer can make without the ball rolling?
B)How much time does the ball spend in the air
C) What is the maximum height reached by the ball

Homework Equations



gravity= -9.8 m/s

The Attempt at a Solution


109cos(45)=77.1 km/hr
t=77.1/g
9.8m/s *1/1000m *3600^2=127008
 
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sophiegirl411 said:

Homework Statement



A golfer hits the ball with an initial speed of 109km/hr
A) What is the longest hole in one (in km) that he golfer can make without the ball rolling?
B)How much time does the ball spend in the air
C) What is the maximum height reached by the ball

Homework Equations



gravity= -9.8 m/s

The Attempt at a Solution


109cos(45)=77.1 km/hr
t=77.1/g
9.8m/s *1/1000m *3600^2=127008

If g = 9.81, you need to change 109 km/h into metres per second