A bullet is fired horizontally with 20m/s. In the absence of air friction its horizontal velocity after 2 second will be:
Correct answer: E. 20m/s
- A. 10m/s
- B. 05m/s
- C. 60 m/s
- D. 40m/s
- E. 20m/s
Explanation
In the absence of air friction, the horizontal velocity of a projectile remains constant throughout its motion. Therefore, the horizontal velocity of the bullet after 2 seconds will still be 20 m/s. So, the correct answer is: 20 m/s. As it is a numerical only one option E is correct.
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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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