Brandon launches a projectile at an angle of 75° above the horizontal, which strikes the ground a certain distance down range. For what other angle of launch at the same speed would the projectile land just as far away?

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Answer 1 · 2015-11-28T22:39:08

#15^@#

Complementary launch angles give the same range under the same conditions.

This means the two angles must add up to #90^@#.

So #90-75=15^@#

The maximum range is when the launch angle is #45^@#.