Agolfer on a level fairway hits a ball at an angle of 21° to the horizontal that travels 99 yd before striking the ground. he then hits another ball from the same spot with the same speed, but at a different angle. this ball also travels 99 yd. at what angle was the second ball hit? (neglect air resistance.)

69°

Explanation:

Projectiles that land at the same elevation they're launched from will have the same range if the launch angles are complementary (add up to 90°).

The complement of 21° is 69°.

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.