For a projectile in flight, neglecting air resistance, the horizontal component of velocity
Correct answer: C. stays constant, because no horizontal force acts
- A. increases steadily
- B. decreases steadily
- C. stays constant, because no horizontal force acts
- D. becomes zero at the highest point
Explanation
Gravity acts vertically only, so the horizontal motion is uniform while the vertical motion is uniformly accelerated, and treating the two independently is the key to every projectile problem. At the highest point the vertical component is zero but the horizontal component is unchanged, so the speed there is not zero. This is why a bomb released from a moving aircraft continues to travel forward with it.
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About Projectile Motion
Projectile motion combines uniform horizontal motion with vertically accelerated motion under gravity, assuming air resistance is neglected. Questions use the components of initial velocity to find time of flight, maximum height, horizontal range and position, while distinguishing projectile motion from general circular or one dimensional motion.
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