Two projectiles are launched 50$\degree$ above horizontal but with different initial speeds. Which of the following must be true while the projectiles are in the air? (Ignore air resistance.)
A) The projectiles will reach the same maximum height.
B) The horizontal speeds of both projectiles are the same.
C) The horizontal accelerations of both projectiles are the same: zero.
D) The one with larger initial speed will experience a larger vertical acceleration.

Question

Quizplus · Accepted Answer

The horizontal acceleration of both projectiles is the same: zero. This is because, in the absence of air resistance, the only force acting on the projectiles is gravity, which affects vertical motion, not horizontal.

Two Projectiles Are Launched 50 °\degree° Above Horizontal but with Different Initial Speeds

Two Projectiles Are Launched 50 $\degree$ Above Horizontal but with Different Initial Speeds