Answer: Speed is constant, velocity changes.
- A Speed is constant, velocity is constant
- B Speed changes, velocity is constant
- C Speed is constant, velocity changes
- D Both speed and velocity change
Correct answer: C. Speed is constant, velocity changes
Explanation: In uniform circular motion, speed (magnitude) is constant but velocity direction changes continuously.
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.