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15 July, 00:57

A golfer 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.)

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  1. 15 July, 01:26
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    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°.
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