A projectile is fired horizontally with an initial speed of 20 m/s, Its horizontal speed 3s later is:
Correct answer: A. 20 m/s
- A. 20 m/s
- B. 6067 m/s
- C. 60 m/s
- D. 29.4 m/s
Explanation
The key principle in projectile motion is that the horizontal component of the velocity remains constant if there is no air resistance. Therefore, the horizontal speed of 20 m/s will remain unchanged 3 seconds later. Option B (6067 m/s) and Option C (60 m/s) represent incorrect interpretations of projectile motion as they suggest a change in horizontal speed. Option D (29.4 m/s) incorrectly applies gravitational acceleration to horizontal motion, which only affects vertical speed.
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About Force and Motion
Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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