A projectile is launched at point 0 and follows the path OPQRS as shown. Air resistance may be neglected. Which statement is true for the projectile when it is at the highest point Q of its path?
Correct answer: A. The horizontal component of the projectile's acceleration is zero.
- A. The horizontal component of the projectile's acceleration is zero.
- B. The horizontal component of the projectile's velocity is zero.
- C. The kinetic energy of the projectile is zero.
- D. The momentum of the projectile is zero.
Explanation
At the highest point of its trajectory, the projectile's vertical velocity becomes zero, meaning there's no change in the vertical velocity. However, gravity continues to act vertically, so while the vertical acceleration might not be zero, the horizontal component of the acceleration remains zero throughout the projectile's motion. Hence, this statement is true at point Q.
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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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