Projectile motion near the Earth's surface can be treated as two independent motions because
Agravity acts equally in all directions
Bthe horizontal motion has constant acceleration while the vertical motion has constant speed
Cthe horizontal motion is at constant speed while the vertical motion is accelerated by gravity
Dboth horizontal and vertical motions have zero acceleration
Answer & Solution
Correct answer: C. the horizontal motion is at constant speed while the vertical motion is accelerated by gravity
In ideal projectile motion, gravity acts only vertically downward. Therefore horizontal motion has constant velocity, while vertical motion has constant acceleration $-g$.
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