A projectile is launched at an angle of 15° above the horizontal and lands downrange.With no air resistance,what other projection angle for the same speed would produce the same downrange distance?
A)30°
B)45°
C)50°
D)75°
E)90°

Question

Quizplus · Accepted Answer

For a given launch speed, the range of a projectile launched in a vacuum (ignoring air resistance) is the same for two angles that add up to 90 degrees. Since the given angle is 15 degrees, the complementary angle that would give the same range is 75 degrees (90 - 15 = 75).

A Projectile Is Launched at an Angle of 15° Above