Posted by **Emilea** on Thursday, February 7, 2013 at 1:11pm.

A golfer has to hit a ball over a tree that is 12.0 meters high from 40.0 meters away. The ball is hit with speed v at an angle (-) to the horizontal. Neglect any effect due to air. The golfer hits the ball with an initial velocity 30 degrees to the horizontal. Calculate the speed that must be given to the ball for it to just clear the tree.

*Note the ball DOES NOT have a vertical velocity of 0m/s when it passes over the tree.

- Physics -
**Steve**, Thursday, February 7, 2013 at 2:43pm
well, you know that

y = -g/(2v^2) sec^2 θ x^2 + tanθ x

= -4.9(4/3)/v^2 x^2 + 0.5773 x

If it just clears the tree (not brushing any branches), then y(40) = 12, so

12 = -6.5333/v^2 (40)^2 + 0.5773(40)

v = 30.7 m/s

- Physics -
**Emilea**, Wednesday, February 13, 2013 at 12:40pm
Thank you!

## Answer This Question

## Related Questions

- physics - A golfer is attempting to hit the ball onto an 18m green over a gorge...
- grade 11 physics - A championship golfer uses a nine iron to chip a shot right ...
- physics - a golfer hits a golf ball an initial velocity of 54m/s [42 degrees ...
- physics - a golfer hits a golf ball an initial velocity of 54m/s [42 degrees ...
- physical science - A golfer on a level fairway hits a ball at an angle of 38° to...
- physics - A baseball is hit with a speed of 27 meters per second at an angle of...
- PHY SCI - A golfer on a level fairway hits a ball at an angle of 42* to the ...
- Physics - A basketball player shoots a free throw at a 50 degree angle. Assume ...
- Physics - A home run is hit such a way that the baseball just clears a wall 30 m...
- Physics - A home run is hit such a way that the baseball just clears a wall 19 m...

More Related Questions