If air resistance is neglected and the initial speed of a projectile is halved, its range
A) doubles.
B) decreases by one-half.
C) increases by a factor of four.
D) decreases by a factor of four.
E) does not change.

Question

Quizplus · Accepted Answer

The range of a projectile is directly proportional to the square of its initial velocity. If the initial speed is halved, it becomes 1/4 of the original value, so the range will be 1/16 of the original range, or decreased by a factor of four.

If Air Resistance Is Neglected and the Initial Speed of a Projectile