A projectile is fired horizontally with an initial speed of 20 m/s. Its horizontal speed 3 s later will be:
Correct answer: A. 20 m/s
- A. 20 m/s
- B. 6.67 m/s
- C. 60 m/s
- D. 29.4 m/s
Explanation
With no horizontal acceleration (neglecting air resistance), horizontal velocity remains constant at 20 m/s irrespective of time elapsed.
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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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