For general projectile motion,when the projectile is at the highest point of its trajectory,
A) its acceleration is zero.
B) its velocity is perpendicular to the acceleration.
C) its velocity and acceleration are both zero.
D) the horizontal component of its velocity is zero.
E) the horizontal and vertical components of its velocity are zero.

Question

Quizplus · Accepted Answer

At the highest point of its trajectory, a projectile's vertical velocity component is zero, but it still has a horizontal velocity component. Gravity acts downward, making the acceleration due to gravity (9.8 m/s^2) directed vertically downward. Therefore, the velocity (horizontal at the peak) is perpendicular to the acceleration (vertical).

For General Projectile Motion,when the Projectile Is at the Highest