Question

For projectile motion on level ground assuming negligible air resistance (the initial angle being neither 0o nor 90o): is the acceleration ever zero?

Answer 1

No, For projectile motion on level ground assuming negligible air resistance the acceleration can never be zero because of gravity.

What is projectile motion?

When an item or particle (a projectile) is launched toward the surface of the Earth and moves along a curved route only under the influence of gravity, this is referred to as projectile motion (in particular, the effects of air resistance are passive and assumed to be negligible). Galileo demonstrated that this curving path was a parabola, however it can also be a straight line in the unique situation where it is hurled straight up. Ballistics is the study of such motions, and this trajectory is a ballistic trajectory. Gravity, which works downward and gives the item a downward acceleration toward the Earth's center of mass, is the sole force of mathematical significance that is actively acting on it. The object's inertia means that no outside force is required to keep the horizontal velocity component of the object's motion in motion. Additional study is necessary to take other forces into accounts, such as internal propulsion (as in a rocket) or aerodynamic drag. A ballistic missile is a missile that is only guided for the brief time it is powered up, and the rest of the time it follows the rules of classical physics.

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