A projectile is fired into the air at an angle of 50° above ground level and hits a target downrange. It will also hit the target if fired at an angle of
A)40°.
B)45°.
C)55°.
D)60°.
E)none of the above

Question

Quizplus · Accepted Answer

The projectile's range is the horizontal distance it travels before hitting the ground. The range is maximum when the projectile is fired at an angle of 45°. Therefore, if the projectile hits the target when fired at an angle of 50°, it will also hit the target if fired at an angle slightly less or slightly more than 50°. 
Since 40° is less than 50° and 55° is more than 50°, they are the only two angles that are close enough to 50° to result in hitting the target. Therefore, the answer is A) 40° and C) 55°.

A Projectile Is Fired into the Air at an Angle