Projectiles: While an object is in projectile motion (with upward being positive) with no air resistance
A) the horizontal component of its velocity remains constant and the horizontal component of its acceleration is equal to -g.
B) the horizontal component of its velocity remains constant and the vertical component of its acceleration is equal to -g.
C) the horizontal component of its velocity remains constant and the vertical component of its acceleration is equal to zero.
D) the vertical component of both its velocity and its acceleration remain constant.
E) the vertical component of its velocity remains constant and the vertical component of its acceleration is equal to -g.

Question

Quizplus · Accepted Answer

In projectile motion, the horizontal component of velocity remains constant because there is no acceleration acting in the horizontal direction. However, in the vertical direction, the acceleration due to gravity (-g) is acting downward, so the vertical component of acceleration is -g. The vertical component of velocity changes due to this acceleration, so it does not remain constant. Therefore, choice B is the best answer.

Projectiles: While an Object Is in Projectile Motion (With Upward