Answer: constant.
- A constant
- B steadily increasing
- C steadily decreasing
- D always zero
Correct answer: A. constant
Explanation: With no horizontal force (ignoring air resistance), the horizontal velocity stays constant.

Projectiles at equal speed: range is maximum at 45°, and complementary angles (30° and 60°) share the same range. Image: Cmglee, CC BY-SA 3.0, via Wikimedia Commons.
Concept context
Vectors, projectile motion, uniform circular motion, and relative velocity - the foundation of 2D kinematics for NEET and JEE.