In projectile motion the acceleration in the vertical direction is:
Correct answer: A. Remains constant
- A. Remains constant
- B. Varies with time
- C. Zero
- D. Is taken as positive
Explanation
In projectile motion, the only force acting on the projectile in the vertical direction is gravity. This results in a constant vertical acceleration of approximately 9.8 m/s2 downwards. Hence, the correct answer is that the vertical acceleration remains constant. The other options are incorrect because: the acceleration does not vary with time, it is not zero because gravity acts continuously, and it is conventionally considered negative, not positive, in standard coordinate systems.
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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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