Aflashlight at the bottom of a 4.00m deep swimming pool sends a ray upward and at an angle such that the ray strikes the surface of the water 1.50 meters from a point directly above the flashlight. what angle in air does the emerging ray make with the water

During a medieval siege of a castle, the attacking army uses a trebuchet to hurl heavy stones at the castle walls. if the trebuchet launches the stones with a velocity of at an angle of 50.0°, (a) how long does it take the stone to hit the ground? (b) what is the maximum distance that the trebuchet can be from the castle wall to be in range? (c) how high will the stones go? show all your work.